View source for Type 23 frigate

{{Short description|Class of frigates built for the Royal Navy}}
{{Use British English|date=October 2012}}
{{Use dmy dates|date=June 2021}}
{{Infobox ship
|section1={{Infobox ship/image
 | image = HMS Sutherland (F81) MoD.jpg
 | image_caption = HMS ''Sutherland'' in December 2012
 }}

|section2={{Infobox ship/class overview
  | name                     = Type 23 frigate
  | builders                 = [[Yarrow Shipbuilders]] and [[Swan Hunter]]
  | operators                = * {{navy|United Kingdom}}
                               * {{navy|Chile}}
  | class_before             = * [[Type 22 frigate]]
  | class_after              = 
* [[Type 26 frigate]] (under construction)
* [[Type 31 frigate]] (under construction)
  | subclasses               = 
  | cost                     = £130 million per ship
  | built_range              = 
  | in_service_range         = 
  | in_commission_range      = 24 November 1987
  | total_ships_building     = 
  | total_ships_planned      = 16
  | total_ships_completed    = 16
  | total_ships_canceled    = 
  | total_ships_active       = 7 Royal Navy, 3 Chilean Navy
  | total_ships_laid_up      = 
  | total_ships_lost         = 
  | total_ships_retired      = 6 (Royal Navy)
  | total_ships_preserved    = 
 }}

|section3={{Infobox ship/characteristics
  | hide_header              = 
  | header_caption           = 
  | type                = Anti-submarine warfare [[frigate]]
  | displacement        = {{convert|4900|t|LT|lk=on|abbr=on}}<ref>{{cite web |url=https://www.royalnavy.mod.uk/the-equipment/ships/frigates/type-23-frigate |title=Type 23 Frigate |website=Royal Navy |access-date=25 March 2019}}</ref>
  | length              = {{convert|133.0|m|ftin|abbr=on}}
  | beam                = {{convert|16.1|m|ftin|abbr=on}}
  | height              = 
  | draught             = {{convert|7.3|m|ftin|abbr=on}}
  | power               = 
  | propulsion          = * [[Combined diesel-electric and gas|CODLAG]]:
                          ** 4 × {{convert|1510|kW|abbr=on|0}} [[Paxman Valenta]] 12CM diesel generators (Non-PGMU ships)
                          ** 4 × {{cvt|1,650|kW|shp}} [[MTU Friedrichshafen|MTU]] 12V4000 M53 diesel generators (PGMU ships)
                          ** 2 × [[General Electric Company|GEC]] [[electric motor]]s delivering {{convert|2980|kW|abbr=on|0}} each
                          ** 2 × [[Rolls-Royce Marine Spey]] SM1C delivering {{convert|19500|kW|abbr=on|0}}
  | speed               = In excess of {{convert|28|kn|lk=in}}
  | range               = {{convert|7500|nmi|lk=in|abbr=on|-3}} at {{convert|15|kn|abbr=on}}
  | endurance           = 
  | complement          = 185 (accommodation for up to 205)
  | sensors             = 
  | EW                  = * UAT Mod 1
                          * [[Seagnat]]
                          * Type 182 towed torpedo decoy
                          * [[SSTD|Surface Ship Torpedo Defence]]
  | armament            = 
*''Anti-air missiles:''
**1 × 32-cell [[Sea Ceptor]] GWS 35 Vertical Launching System (VLS) canisters for 32 missiles (1–25+&nbsp;km)<ref>{{cite web |url=https://www.edrmagazine.eu/royal-navy-unveiled-sea-ceptor-and-launched-first-user-group-at-dsei-2017 |title=Royal Navy unveiled Sea Ceptor and launched first user group at DSEI 2017 |last=Peruzzi |first=Luca |work=European Defence Review |access-date=21 June 2021 }}</ref> (replaced original [[Sea Wolf (missile)|Sea Wolf]] SAM) 
*''Anti-ship missiles:''
**2 × quad [[Harpoon (missile)|Harpoon Block 1C]] (originally fit, retired from most ships 2023, retained on F229 as of late 2024);<ref>{{cite tweet |url=https://x.com/NavyLookout/status/1876620077660880897/photo/1|user=NavyLookout |number=1876620077660880897 |title=@NavyLookout. @HMSLANCASTER conducted boarding operations under the command of CTF-150 to deter and disrupt illicit activities on December 31st. |date=7 January 2025 |access-date=8 January 2025}}</ref><ref>{{cite web |date=19 December 2023 |url=https://www.janes.com/defence-news/news-detail/first-nsm-fit-on-rn-type-23-frigate |title=First NSM fit on RN Type 23 frigate |website=Janes |last=Scott |first=Richard |access-date=23 April 2024}}</ref><ref name=navylookoutAS>{{cite web |date=August 26, 2021 |url=https://www.navylookout.com/contenders-for-the-royal-navys-interim-anti-ship-missile-requirement/ |title=Contenders for the Royal Navy's interim anti-ship missile requirement |website=navylookout.com |access-date=October 31, 2021}}</ref> being replaced by [[Naval Strike Missile]] (fit to F79, F82 & F239 as of early 2025)<ref>{{cite web |date=March 9, 2025 |url=https://www.navylookout.com/hms-richmond-third-royal-navy-warship-to-receive-the-naval-strike-missile/ |title=HMS Richmond third Royal Navy warship to receive the Naval Strike Missile |access-date=March 9, 2025}}</ref><ref>{{cite web |date=December 12, 2024 |url=https://www.navylookout.com/royal-navy-frigate-hms-portland-fitted-with-naval-strike-missiles/ |title=Royal Navy frigate HMS Portland fitted with Naval Strike Missiles |website=navylookout.com |access-date=December 13, 2024}}</ref><ref>{{cite tweet |url=https://twitter.com/NavyLookout/status/1736708119323893959?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Etweet|title=@NavyLookout First view of Royal Navy warship equipped with the Naval Strike Missile. |number=1736708119323893959 |user=NavyLookout |author=Navy Lookout |date=18 December 2023 |access-date=18 December 2023}}</ref><ref>{{cite news |date=23 November 2022 |url=https://www.gov.uk/government/news/royal-navy-ships-to-be-fitted-with-advanced-new-missile-system |title=Royal Navy ships to be fitted with advanced new missile system |work=[[gov.uk]] |access-date=25 November 2022}}</ref><ref>{{cite news |last=Scott |first=Richard |date=February 16, 2022 |url=https://www.janes.com/defence-news/news-detail/uk-confirms-cancellation-of-i-ssgw-programme |title=UK confirms cancellation of I-SSGW programme |work=[[Janes Information Services]] |access-date=February 20, 2022}}</ref>
*''Anti-submarine torpedoes:''
**2 × twin 12.75{{nbsp}}in (324{{nbsp}}mm) [[Sting Ray (torpedo)|Sting Ray torpedo]] tubes
*''Guns:''
**1 × [[BAE Systems|BAE]] [[4.5 inch Mark 8 naval gun|4.5{{nbsp}}inch Mk{{nbsp}}8 naval gun]]
**2 × [[30mm DS30M Mark 2 Automated Small Calibre Gun|30{{nbsp}}mm DS30M Mk2 guns]], ''or'', 2 × 30{{nbsp}}mm DS30B guns
**2 × [[Minigun]]s (replaced by [[Browning .50 caliber machine gun|Browning .50 caliber heavy machine guns]] as of 2023)<ref>{{cite web |url=https://www.navylookout.com/in-focus-the-50-cal-heavy-machine-gun-in-royal-navy-service/ |title=In focus: the 50 cal heavy machine gun in Royal Navy service |publisher=Navy Lookout |date=5 May 2023 |access-date=5 May 2023}}</ref>
**4 × [[FN MAG|General-purpose machine gun]]s
  | armour              = 
  | aircraft            = * 1 × [[AgustaWestland AW159|Wildcat HMA2]], armed with:
                          * 2 × anti-submarine torpedoes or [[Martlet (missile)|Martlet anti-ship (ASM)/air-to-air missiles]],<ref>{{Cite web |date=2 November 2024 |title=The Royal Navy has enhanced its ability to thwart drone attack after helicopter crews downed a pilotless aircraft off the Welsh coast. |url=https://www.royalnavy.mod.uk/news/2024/november/02/20241102-martlet-air-to-air |access-date=2 November 2024 |website=Royal Navy}}</ref> initially deployed with RN carrier strike group helicopters in 2021; [[Sea Venom (missile)|Sea Venom ASM]] reached initial operating capability in 2025 and is projected to achieve full operational capability in 2026.<ref>{{cite web|url=https://www.navylookout.com/initial-operating-capability-declared-for-royal-navy-sea-venom-anti-ship-missile/|title=Initial Operating Capability declared for Royal Navy Sea Venom anti-ship missile |website= Navy Lookout |date=2 October 2025 |access-date=2 October 2025}}</ref><ref>{{Cite web|url=https://www.navylookout.com/royal-navys-sea-venom-light-anti-ship-missile-full-operating-capability-delayed-until-2026/|title = Royal Navy's Sea Venom light anti-ship missile full operating capability delayed until 2026 |website=Navy Lookout |date=21 June 2023}}</ref>
                          *''or''
                          * 1 × [[AgustaWestland AW101|Westland Merlin HM2]], armed with;
                          * 4 × anti-submarine torpedoes
                          * Plus
                          *2 x [[Schiebel Camcopter S-100|Peregrine ISR UAV]] (from mid-2024 on F229)<ref>{{cite web | url=https://www.navylookout.com/peregrine-rotary-wing-uav-to-enter-service-with-the-royal-navy/ | title=Peregrine rotary wing UAV to enter service with the Royal Navy |website=Navy Lookout |date=10 February 2023 | access-date=29 July 2024}}</ref><ref>{{cite web | url=https://www.janes.com/osint-insights/defence-news/sea/uk-peregrine-uas-completes-factory-acceptance-testing | title=UK Peregrine UAS completes factory acceptance testing |website=Janes |date=1 September 2023 | access-date=29 July 2024}}</ref><ref>{{cite tweet |url=https://x.com/NavyLookout/status/1838876479343468865?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Etweet |title=@NavyLookout Recent photos showing two Peregrine RWUAS embarked on @HMSLANCASTER for trials in the Indian Ocean. Both aircraft fitted with the Thales I-Master radar with tactical data link integrated into ship's combat managment [sic] system. |number=1838876479343468865 |user=NavyLookout |date=25 September 2024 |access-date=25 September 2024}}</ref>
  | aircraft_facilities = * Flight deck
                          * Enclosed [[hangar]]
  | notes               = 
  | boats               = 2 × [[Pacific 24]] [[Rigid inflatable boat|RIBs]]
 }}
}}

The '''Type 23 frigate''' or '''Duke class''' is a [[ship class|class]] of [[frigate]]s built for the United Kingdom's [[Royal Navy]]. The ships are named after [[List of dukes in the peerages of the British Isles|British Dukes]], thus leading to the class being commonly known as the Duke class. The first Type 23, {{HMS|Norfolk|F230|6}}, was [[Ship commissioning|commissioned]] in 1989, and the sixteenth, {{HMS|St Albans|F83|6}} was commissioned in June 2002. They form the core of the Royal Navy's [[destroyer]] and frigate fleet and serve alongside the [[Type 45 destroyer]]s. They were designed for [[anti-submarine warfare]], but have been used for a range of uses.<ref>{{cite web |url=http://www.baesystems.com/Businesses/MISSIONSYSTEMS/ProductsandServices/Programmes/type23/index.htm |title=Mission Systems provides the Royal Navy's Type 23 Frigates with combat management systems and radar |website=[[BAE Systems]] |access-date=25 March 2019 |archive-url=https://web.archive.org/web/20120107024142/http://baesystems.com/Businesses/MISSIONSYSTEMS/ProductsandServices/Programmes/type23/index.htm |archive-date=7 January 2012}}</ref> Eight Type 23 frigates remain in service with the Royal Navy, with three vessels having been sold to the [[Chilean Navy]] and five being retired since 2021.{{Citation needed|date=September 2025}}

The Royal Navy's Type 23 frigates will be replaced by the Type 26 [[Global Combat Ship]] and the [[Type 31 frigate]].<ref>{{cite web |url=https://www.royalnavy.mod.uk/the-equipment/ships/future-ships/type-26-frigate |title=Royal Navy Future Ships: Type 26 Global Combat Ship |website=Royal Navy |access-date=25 March 2019}}</ref> {{As of|2021}} it is anticipated that HMS ''St Albans'' will be the last to retire from the Royal Navy, in 2035.<ref name=navylookoutAS>{{cite web |date=August 26, 2021 |url=https://www.navylookout.com/contenders-for-the-royal-navys-interim-anti-ship-missile-requirement/ |title=Contenders for the Royal Navy's interim anti-ship missile requirement |website=navylookout.com |access-date=October 31, 2021}}</ref><ref>{{cite web |url=https://www.royalnavy.mod.uk/News-and-Events/Latest-News/2012/September/24/120820-Future-Type-26 |title=Navy unveils latest design of future frigate |date=20 August 2012 |website=Royal Navy |access-date=25 March 2019 |archive-url=https://web.archive.org/web/20121014002012/https://www.royalnavy.mod.uk/News-and-Events/Latest-News/2012/September/24/120820-Future-Type-26 |archive-date=14 October 2012}}</ref>

==Development==
When first conceived in the late 1970s, the Type 23 was intended to be a light anti-submarine frigate with a [[towed array sonar]] to counter Soviet nuclear submarines operating in the North Atlantic. The Type 23 would be replacing the {{sclass|Leander|frigate|0}} frigates (which had entered service in the 1960s) and the [[Type 21 frigate]] (a general purpose design that had recently entered service) as the backbone of the Royal Navy's surface ship anti-submarine force. The procurement of the class was announced in the [[1981 Defence White Paper]] as "simpler and cheaper than the [[Type 22 frigate|Type 22]] [with] its characteristics... framed with an eye to the export market as well as Royal Navy needs."<ref>{{Cite web|title=The United Kingdom Defence Programme: The Way Forward|url=https://c59574e9047e61130f13-3f71d0fe2b653c4f00f32175760e96e7.ssl.cf1.rackcdn.com/991284B4011C44C9AEB423DA04A7D54B.pdf|archive-url=https://web.archive.org/web/20191011034231/https://c59574e9047e61130f13-3f71d0fe2b653c4f00f32175760e96e7.ssl.cf1.rackcdn.com/991284B4011C44C9AEB423DA04A7D54B.pdf|archive-date=2019-10-11|url-status=live}}</ref>

[[File:HMS Richmond MOD 45155880.jpg|thumb|left|Overhead view of HMS ''Richmond'' in August 2013]]
The ship was designed by the [[Royal Corps of Naval Constructors]], in close partnership with the prime contractor, [[Yarrow Shipbuilders]].<ref>{{Cite news|last=Fishlock|first=David|date=13 May 1983|title=Last ditch attempt to sink the frigates|work=Financial Times}}</ref> No anti-air warfare system was planned, however the lessons learned during the Falklands War led to the introduction of the vertically launched [[Sea Wolf (missile)|Sea Wolf missile]]; In June 1984 [[BAe Dynamics]] was awarded a development contract for the missile system.<ref>{{cite news |last=McLain |first=Lynton |date=10 July 1987 |title=Design Changes Add £90M To Cost Of Frigate |work=Financial Times}}</ref><ref>{{Cite news|last=Donne|first=Michael|date=9 June 1984|title=BAe wins MoD contract to develop Seawolf missile|work=Financial Times}}</ref> Unlike conventional Sea Wolf, the missile is boosted vertically until it clears the ship's superstructure, and then turns to fly directly to the target. Consequently, the ship's structure does not impose no-fire directions that would delay or inhibit missile firing in a conventionally launched system. With the addition of [[Harpoon missile|Harpoon]] [[surface-to-surface missile]]s and a medium calibre gun for [[naval gunfire support]], the Type 23 had evolved into a more complex and balanced vessel optimised for general warfare, which introduced a host of new technologies and concepts to the Royal Navy. These included extensive [[radar cross-section]] reduction design measures, automation to substantially reduce crew size, a [[combined diesel-electric and gas]] (CODLAG) propulsion system providing very quiet running for anti-submarine operations and a large range.<ref>{{cite news |last=Grove |first=Eric |date=September 1987 |title=The Royal Navy Sails Into Tomorrow |url= |work=Defense & Foreign Affairs}}</ref>

In December 1986 the procurement of a [[Ferranti]] command and control system was cancelled as the specification was deemed to be insufficient to meet the demands of a modern warship, particularly the processing demands of the towed sonar array. [[Sema Group|Dowty-Sema]] won a contract for a replacement command and control system in August 1989, however, the delay meant early Type 23s entered service without the capability to use the Sea Wolf missile system in combat.<ref>{{cite news |last1=Cane |first1=Alan |last2=White|first2=David|date=10 August 1989 |title=MoD Order With Dowty-Sema Is Blow To Ferranti |work= Financial Times}}</ref><ref>{{cite news |last=White |first=David |date=3 January 1990 |title=A beauty waiting for a new brain|work=Financial Times}}</ref>

It was reported in 1998 to the House of Commons that: "Type 23 frigates achieved approximately 85–89 percent average availability for operational service in [the previous] five years with the exception of 1996 when the figure dropped to just over 80 per cent due to a number of ships experiencing a particular defect. This discounts time spent in planned maintenance."<ref name=Hansard10Feb1998>{{cite hansard |title=Type 23 Frigates |url=https://publications.parliament.uk/pa/cm199798/cmhansrd/vo980210/text/80210w23.htm |house=House of Commons |date=10 February 1998 |column_start=195 |column_end=196 |speaker=[[John Reid, Baron Reid of Cardowan|John Reid]] |position=Minister of State for the Armed Forces}}</ref>

Unlike the Type 45 destroyer, the Type 23 frigate does not have the capability to act as a flagship.<ref name=Hansard17Mar11c511>{{cite hansard |title=Frigates |url=https://publications.parliament.uk/pa/cm201011/cmhansrd/cm110317/text/110317w0001.htm |house=House of Commons |date=17 March 2011 |column=511W |speaker=[[Peter Luff]] |position=[[Minister for Defence Procurement]]}}</ref>

===Programme costs===
Prior to the Falklands War the cost of the Type 23 frigates was estimated at £75&nbsp;million each (September 1980 prices)<ref name=Hansard11Jan85T23>{{cite hansard |title=Written Answers: Type 23 Frigates |url=https://api.parliament.uk/historic-hansard/written-answers/1985/jan/11/type-23-frigates |house=House of Commons |date=11 January 1985 |column=561W |speaker=[[John Lee, Baron Lee of Trafford|John Lee]] |position=[[Parliamentary Under-Secretary of State]] to the Minister for Defence Procurement}}</ref> Changes following the experiences in the Falklands, including improved damage control and fire precautions,<ref name=Hansard19Ju83>{{cite hansard |title=Defence Estimates |url=https://api.parliament.uk/historic-hansard/commons/1983/jul/19/defence-estimates#S6CV0046P0-01139 |house=House of Commons |date=19 July 1983 |column=261 |speaker=[[Ian Stewart, Baron Stewartby|Ian Stewart]] |position=Minister of State for the Armed Forces}}</ref> led to an increased cost estimated at £110&nbsp;million (1984–85 prices)<ref name=Hansard11Jan85T23/>
By 2001, the Ministry of Defence said the cost of {{HMS|Norfolk|F230|6}} was £135.449&nbsp;million and the remaining ships would have a final cost between £60&nbsp;million and £96&nbsp;million each. The Ministry of Defence said in 1998 that the Merlin ASW helicopter was costing them £97M each (this was for an order for 44 airframes), and that this was 57% of the cost of Type 23.<ref name=WWSpr1998p13>{{cite magazine |title=At Hebburn |magazine=Warship World |date=18 February 1998 |publisher=Maritime Books |page=13 |quote=This figure of £97&nbsp;million each included research and development costs.}}</ref> From this it can be calculated that the cost of Type 23 was £170.1M each. The Government's declared policy for construction contracts for Type 23 was "...competition, the aim being to secure best value for money for the defence budget." while maintaining "sufficient warship-building capacity to meet likely future defence requirements and a competitive base"<ref name=Hansard02Nov89c333>{{cite hansard |title=Written Answers: Frigates |url=https://api.parliament.uk/historic-hansard/written-answers/1989/nov/02/frigates |house=House of Commons |date=2 November 1989 |column=334W |speaker=[[Michael Neubert]] |position=Under-Secretary of State for the Armed Forces}}</ref>

HMS ''Norfolk'' was the first of the class to enter service, commissioned into the fleet on 1 June 1990 at a cost of £135.449&nbsp;million; later vessels cost £60–96&nbsp;million.<ref name="Norfolkcost">{{cite hansard |title=Written Answers: Type 23 Frigates |url=https://publications.parliament.uk/pa/cm200102/cmhansrd/vo010705/text/10705w05.htm |house=House of Commons |date=5 July 2001 |column=246W |speaker=[[Adam Ingram (Labour politician)|Adam Ingram]] |position=Minister of State for the Armed Forces}}</ref>

==Upgrades and future technologies==
[[File:Propeller, National Maritime Museum.jpg|thumb|The Type 23's propeller is specially designed to reduce underwater noise during anti-submarine operations.]]

===Mid-life refit===
The class underwent{{when |date=November 2016}} mid-life refits which lasted 12–18 months and cost £15-20m. Aside from refurbishment of the mess decks and drive train, the ships are being retrofitted with a transom flap which can add up to {{convert|1|kn|spell=in}} to the top speed<ref>{{cite news |url=http://publishing.yudu.com/Anav2/NavyNewsSept08/resources/6.htm?skipFlashCheck=true |title=A Forth for Good |page=6 |newspaper=[[Navy News]] |date=September 2008}}</ref> and reduce fuel consumption by 13%, and Intersleek [[anti-fouling paint]] which added {{convert|2|kn|spell=in}} to the top speed of the carrier ''Ark Royal''.<ref>{{cite web |url=http://www.royalnavy.mod.uk/News-and-Events/Reference-Library/~/media/Files/Navy-PDFs/News-and-Events/Naval%20Publications/royal_navy_matters2010.pdf |title=The Royal Navy's Fleet |page=52 |newspaper=Royal Navy Matters |year=2010 |publisher=Royal Navy |access-date=16 October 2011}}</ref> Although the top speed of the Duke class is commonly quoted as 28 knots, the caption of an official Navy photo suggests that ''Lancaster'' was capable of 32 knots even before her mid-life refit.<ref>{{cite web |url=http://www.defenceimagery.mod.uk/fotoweb/archives/5046-All%20News%20-%20Stock/Archive/Archive/Royal%20Navy/45139/45139105.jpg |title=Duke class Type 23 Frigate F229 HMS Lancaster steaming at 32 knots |date=12 September 1999 |website=Ministry of Defence Image Database |access-date=25 March 2019 }}{{Dead link|date=March 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref>{{cite web |url=http://www.royalnavy.mod.uk/The-Fleet/Ships/Frigates-and-Destroyers/Type-23-Frigates/HMS-Sutherland/Sutherland-Info |title=HMS Sutherland – More About The Ship |website=Royal Navy |access-date=16 October 2011}}</ref> The Sea Wolf Mid Life Update (SWMLU) improves the sensors and guidance of the missiles, point defences are further improved with new remotely operated 30&nbsp;mm guns, and Mod 1 of the [[4.5-inch Mark 8 naval gun|Mk8 main gun]] has an all-electric loading system and a smaller radar cross-section. The communications and command systems are also upgraded.{{Citation needed|date=November 2024}}

A further Life Extension (LIFEX) Upkeep project saw the Sea Wolf missiles replaced with the new [[Sea Ceptor]] anti-air defence missiles;<ref>{{cite web |url=http://www.adsadvance.co.uk/hms-argyll-upkeep-marks-start-of-type-23-life-extension.html |title=HMS ''Argyll'' upkeep marks start of Type 23 life extension |date=16 June 2015 |website=ADS Advance |access-date=3 August 2016}}</ref> these were first test-fired from HMS ''Argyll'' on 4 September 2017.<ref>{{cite web |url=https://www.bbc.co.uk/news/av/uk-scotland-41151136 |title=New missiles tested off Scottish coast |date=4 September 2017 |website=BBC News |access-date=4 September 2017}}</ref>

===Sonar 2087===
{{Further|Sonar 2087}}
Sonar 2087 is described by its manufacturer as "a towed-array system that enables Type 23 frigates to hunt the latest submarines at considerable distances and locate them beyond the range at which they [submarines] can launch an attack."<ref>{{cite web |url=https://www.globalsecurity.org/military/library/news/2010/07/mil-100713-thales01.htm |title=HMS Sutherland's Sonar Impresses on First Major Test |author=Thales Group |author-link=Thales Group |date=13 July 2010 |website=Globalsecurity.org |access-date=25 March 2019}}</ref> Sonar 2087 was fitted to eight Type 23 frigates in mid-life refits between 2004 and 2012; the five oldest Type 23 frigates, HMS ''Montrose'', ''Monmouth'', ''Iron Duke'', ''Lancaster'' and ''Argyll'' are not scheduled to receive Sonar 2087. These ships will instead continue to be employed across the normal range of [[standing Royal Navy deployments]].<ref>{{cite web |date=17 July 2006 |title=Written Answers: Type 23 Frigates (Sonar 2087) |url=https://www.theyworkforyou.com/wrans/?id=2006-07-17d.85382.h |access-date=3 August 2016 |website=TheyWorkForYou}}</ref> The Chilean Navy is procuring a number of Sonar 2087 towed arrays from Thales Underwater Systems to equip its multipurpose frigates.{{Citation needed|date=April 2023}}

===Artisan 3D radar===
[[File:HMS Argyll Type 997 Radar MOD 45156530.jpg|thumb|upright|Type 997 Artisan 3D radar on HMS ''Argyll'' following her 2010 refit]]
{{Main|Type 997 Artisan radar}}

The Type 23's original medium-range radar was replaced by [[BAE Systems]] Type 997 Artisan 3D radar; the project was worth £100&nbsp;million and the contract was announced on 4 August 2008.<ref>{{cite web |url=http://www.royalnavy.mod.uk/server/show/ConWebDoc.13459/changeNav/6568 |title=Navy to Get New Radar |date=4 August 2008 |website=Royal Navy |access-date=25 March 2019 |archive-url=https://web.archive.org/web/20090205195822/http://www.royalnavy.mod.uk/server/show/ConWebDoc.13459/changeNav/6568 |archive-date=5 February 2009}}</ref> It is a medium-range radar designed to be capable of operating effectively in littoral zones and improving air-defence, anti-surface (anti-ship) and air traffic management capabilities of the Type 23 frigates. The radar is also designed to combat complex jammers.<ref>{{cite web |url=http://www.baesystems.com/Sites/SAS/ProductServices/MaritimeC4I/ArtisanRadar/index.htm |title=Artisan 3D Radar |website=BAE Systems |access-date=3 August 2016 |archive-url=https://web.archive.org/web/20111211032251/http://www.baesystems.com:80/Sites/SAS/ProductServices/MaritimeC4I/ArtisanRadar/index.htm |archive-date=11 December 2011}}</ref> HMS ''Iron Duke'' was the first Type 23 frigate to receive the Artisan radar during her refit in 2012–13.<ref>{{cite web |url=http://www.baesystems.com/Newsroom/NewsReleases/autoGen_111813102928.html |title=New Royal Navy Type 997 radar is put through its paces on the Isle of Wight |date=13 September 2011 |website=BAE Systems |access-date=16 October 2011 |archive-url=https://web.archive.org/web/20111101085635/http://www.baesystems.com/Newsroom/NewsReleases/autoGen_111813102928.html |archive-date=1 November 2011}}</ref>

It is claimed the radar is five times more capable than the Type 996 radar it replaces.<ref>{{cite web |url=http://www.theengineer.co.uk/military-and-defence/news/navys-new-type-23-frigate-radar-five-times-more-efficient/1015689.article |title=Navy's new Type 23 frigate radar 'five times more efficient' |date=6 March 2013 |website=The Engineer |access-date=3 August 2016 |archive-url=https://web.archive.org/web/20140904211411/http://www.theengineer.co.uk/military-and-defence/news/navys-new-type-23-frigate-radar-five-times-more-efficient/1015689.article |archive-date=4 September 2014}}</ref><ref>{{cite web |url=http://www.defencetalk.com/iron-duke-back-at-sea-after-major-upgrade-48237/ |title=''Iron Duke'' Back at Sea After Major Upgrade |date=26 June 2013 |website=Defence Talk |access-date=25 March 2019}}</ref>

===Common Anti-Air Modular Missile===
{{Further|CAMM (missile family)}}
CAMM(M), the maritime variant of the Common Anti-Air Modular Missile, started to replace the [[Sea Wolf (missile)|Sea Wolf]] missiles on the Type 23 frigates from 2016. CAMM(M) has a longer range of 1–25+&nbsp;km compared to the 1–10&nbsp;km offered by the Sea Wolf missile. An option exists to give the missile a surface-attack capability, though it is currently understood the Royal Navy will not take that option, because of cost.<ref>{{cite web |url=http://www.mbda-systems.com/mediagallery/files/CAMM-family_background.pdf |title=Press Information – Common Anti-air Modular Missile |website=MBDA Systems |date=June 2011 |access-date=16 October 2011 |archive-url=https://web.archive.org/web/20110811224119/http://www.mbda-systems.com/mediagallery/files/CAMM-family_background.pdf |archive-date=11 August 2011}}</ref> Like Sea Wolf, CAMM(M) will be [[Vertical launching system|VLS]] launched; however due to its design, CAMM(M) can be packed much more tightly into the VLS, with up to four CAMM(M) fitting into the space occupied by one Sea Wolf missile.<ref>{{cite web |url=http://www.aviationweek.com/aw/blogs/defense/index.jsp?plckController=Blog&plckBlogPage=BlogViewPost&plckPostId=Blog%3A27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3A1718c0a6-bc66-4b43-b2fd-4836fc144228 |first=Bill |last=Sweetman |title=CAMM on Path To Replace Seawolf |date=23 May 2011 |website=[[Aviation Week]] |access-date=16 October 2011 |archive-date=21 March 2010 |archive-url=https://web.archive.org/web/20100321164415/http://www.aviationweek.com/aw/blogs/defense/index.jsp?plckController=Blog |url-status=dead }}</ref> CAMM(M) is known as Sea Ceptor in Royal Navy service.

=== Martlet Lightweight Multirole Missile ===
On an unspecified date in early 2019, {{HMS|Sutherland|F81|6}} tested a modified mounting for the [[30mm DS30M Mark 2 Automated Small Calibre Gun|30mm cannon]] which incorporated a launcher for five [[Martlet (missile)|'Martlet' Lightweight Multirole Missiles]], by firing four of them at a small speedboat target at the Aberporth range in Wales. The concept of mounting the missile alongside the 30mm Bushmaster cannon was tested just 5 months after the idea's conception.{{Citation needed|date=November 2024}}

The intended role of the Martlet is to further extend the Type 23's capabilities against small, fast moving targets beyond the current 30mm, GPMG and Minigun options to provide a long range 'stand-off' ability. However, a 2023 report suggested that the tests had not been deemed successful due to efflux management issues on the Type 23. The missile is therefore likely to be limited to employment on the Wildcat helicopter.<ref>{{Cite web |date=6 August 2023 |title=Ukraine war sees uncrewed surface vessels mature into a serious threat |url=https://www.navylookout.com/ukraine-war-sees-uncrewed-surface-vessels-mature-into-a-serious-threat/ |website=Navy Lookout}}</ref>

=== Anti-ship missile ===

In March 2019, a study commenced for an interim replacement for the ageing [[Harpoon (missile)|Harpoon]] anti-ship missiles, until completion of the Anglo-French Future Cruise/Anti-Ship Weapon ([[Perseus (missile)|FC/ASW]]) programme which was scheduled to enter service in the 2030s.<ref>{{cite news |last=Eshel |first=Tamir |date=13 April 2021 |url=https://defense-update.com/20210413_i-ssgw.html |title=IAI, Thales Offer Sea Serpent Missiles to Replace the Harpoon on the Royal Navy Frigates |work=[[Defense Update]] |access-date=18 April 2021}}</ref> The interim replacement missile was originally planned to be fitted to five of the newer Type 23 frigates.<ref name="navylookoutAS" />

In November 2021, then First Sea Lord, Admiral Tony Radakin, said that the program had been paused and would likely be cancelled.<ref>{{cite web |url=https://www.navylookout.com/royal-navy-rows-back-on-plans-to-acquire-new-anti-ship-missiles-before-2030s/ |title=Royal Navy rows back on plans to acquire new anti-ship missiles before 2030s |work=Navy Lookout |date=4 November 2021 |access-date=4 November 2021|archive-url=https://web.archive.org/web/20211104094541/https://www.navylookout.com/royal-navy-rows-back-on-plans-to-acquire-new-anti-ship-missiles-before-2030s/ |archive-date=2021-11-04 |url-status=live}}</ref> In February 2022, the project was cancelled.<ref name="Janes.Feb.2022">{{cite news |last=Scott |first=Richard |date=16 February 2022 |url=https://www.janes.com/defence-news/news-detail/uk-confirms-cancellation-of-i-ssgw-programme |title=UK confirms cancellation of I-SSGW programme |work=[[Janes Information Services]] |access-date=20 February 2022}}</ref> However, in July 2022 the Defence Secretary confirmed that the program had been restarted.<ref>{{Cite web |date=2022-07-06 |title=Royal Navy changes course on interim anti-ship missile for a second time {{!}} Navy Lookout |url=https://www.navylookout.com/royal-navy-changes-course-on-interim-anti-ship-missile-for-a-second-time/ |access-date=2022-07-11 |website=www.navylookout.com |language=en-GB}}</ref> In November 2022, it was announced that the Royal Navy would receive the [[Naval Strike Missile]] (NSM), which will be fitted to a total of 11 vessels, both Type 23 frigates and Type 45 destroyers.<ref>{{cite news | url=https://www.regjeringen.no/en/aktuelt/den-britiske-marinen-tar-i-bruk-norske-sjomalsmissiler/id2948032/ | website=regjeringen.no (Norwegian Government) |date=23 November 2022 | title =Norwegian Naval Strike Missiles to the British Royal Navy}}</ref><ref>{{cite news | url=https://www.kongsberg.com/kda/news/news-archive/2022/the-british-royal-navy-selects-kongsbergs--naval-strike-missile/ | website=kongsberg.com |date=23 November 2022 | title =UNITED KINGDOM'S ROYAL NAVY SELECTS KONGSBERG'S NAVAL STRIKE MISSILE}}</ref>

In 2021, it was reported that only two frigates, ''Montrose'' and ''Kent'', were deployed with a full load of eight Harpoon canisters per ship.<ref name="navylookoutAS" /> In August 2022, it was reported that in preparation for her planned deployment to the [[Persian Gulf]] to replace HMS ''Montrose'', HMS ''Lancaster'' had also been fitted with eight Harpoon anti-ship missiles.<ref>{{cite tweet |url=https://mobile.twitter.com/navylookout/status/1554720023884750848/photo/1 |title=@HMSLANCASTER off the UHAF yesterday after receiving a full outfit of Harpoon missiles ahead of her eventual deployment to the Gulf. |user=NavyLookout |number=1554720023884750848 |date=3 August 2022 |access-date=4 August 2022}}</ref>

==Weapons, countermeasures, capabilities and sensors==
{{Prose|section|date=November 2024}}
[[File:Sea Wolf Missile Firing MOD 45155929.jpg|thumb|upright|HMS ''Montrose'' firing a [[Sea Wolf (missile)|Sea Wolf]] missile]]
[[File:US Navy 020612-N-9407M-518 British frigate HMS Richmond (F-239) launches an AGM-84A "Harpoon" missile.jpg|thumb|HMS ''Richmond'' firing a [[Harpoon (missile)|Harpoon]] anti-ship missile]]
[[File:A 4.5 inch shell is captured in flight as Type 23 frigate HMS Northumberland conducts a gunnery exercise.jpg|thumb|HMS ''Northumberland'' fires her [[4.5-inch Mark 8 naval gun]]]]

===Anti-air warfare===
* [[Type 997 Artisan 3D]] radar installed/being installed on 12 of 13 vessels replacing previous Type 996 Mod 1, 3D surveillance and target indication radar.
* 12 of 13 Royal Navy frigates (plus the Chilean vessels) upgraded with 32-cell [[CAMM (missile family)|Sea Ceptor]] [[Vertical launching system|GWS.35 VLS canisters]]<ref>{{cite news |url=https://www.edrmagazine.eu/royal-navy-unveiled-sea-ceptor-and-launched-first-user-group-at-dsei-2017 |title=Royal Navy unveiled Sea Ceptor and launched first user group at DSEI 2017 |last=Peruzzi |first=Luca |work=European Defence Review |access-date=21 June 2021 }}</ref> (range of over {{convert|25|km|disp=semicolon}}) as replacement for the previous [[Sea Wolf (missile)|Sea Wolf SAM]]. HMS ''Argyll'' was the first ship to receive Sea Ceptor, completing refit in February 2017.<ref>{{cite web |url=https://www.navylookout.com/progress-on-extending-the-life-of-the-royal-navys-type-23-frigates/ |title=Progress on extending the life of the Royal Navy's Type 23 frigates |work=Navy Lookout |date=31 January 2019 |access-date=21 June 2021 }}</ref> As of 2021 in addition to ''Argyll'', ''Westminster'', ''Montrose'', ''Northumberland'', ''Kent'', ''Lancaster'', ''Richmond'' and ''Portland'' had all received Sea Ceptor systems. ''Somerset'' returned to service with Sea Ceptor in March 2022,<ref>{{cite web |url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2022/march/25/20220325-frigate-hms-somerset-returns-to-sea-after-four-years-following-massive-revamp |title=Frigate HMS Somerset returns to sea after four years following massive revamp |publisher=Royal Navy |date=25 March 2022 |access-date=3 April 2022}}</ref> and ''Iron Duke'' followed in May 2023.<ref>{{cite web |url=https://seawaves.com/2023/05/21/hms-iron-duke-completes-five-year-refit/ |title=HMS Iron Duke Completes Five Year Refit |date=21 May 2023 |website=Sea Waves Magazine |access-date=21 May 2023}}</ref> ''St Albans'' and ''Sutherland'' are the final frigates to receive the upgrade, with ''Sutherland'' having begun her refit in April 2021.<ref>{{cite web |url=https://ukdefencejournal.org.uk/british-frigate-returns-to-sea-after-four-years/ |title=British frigate returns to sea after four years |work=UK Defence Journal |last=Allison |first=George |date=28 March 2021 |access-date=21 June 2021 }}</ref><ref name=report2020>{{cite web |url=https://www.navylookout.com/progress-report-extending-the-life-of-royal-navys-type-23-frigates/ |title=Progress report – extending the life of Royal Navy's Type 23 frigates |work=Navy Lookout |date=4 November 2020 |access-date=21 June 2021 }}</ref> The 2021 defence white paper announced that ''Monmouth'' will not receive the upgrade and, together with ''Montrose'', would be retired early.<ref name=ukdjmarch>{{cite web |url=https://ukdefencejournal.org.uk/two-frigates-to-be-scrapped-early/ |title=Two frigates to be scrapped early |work=UK Defence Journal |last=Allison |first=George |date=22 March 2021 |access-date=21 June 2021 }}</ref> ''Monmouth'' was formally withdrawn from service in June 2021, followed by ''Argyll'' and ''Westminster'' in 2024.

===Anti-ship warfare (missiles)===
* Up to eight [[Harpoon (missile)|Harpoon]] [[anti-ship missile]] launchers (apart from those fitted to HMS ''Lancaster'' (F229), withdrawn in 2023/24; being replaced on eleven Type 23 frigates and Type 45 destroyers by the [[Naval Strike Missile]] - NSM; NSM fitted to F79, F82 and F239 as of early 2025).<ref>{{cite web |date=March 9, 2025 |url=https://www.navylookout.com/hms-richmond-third-royal-navy-warship-to-receive-the-naval-strike-missile/ |title=HMS Richmond third Royal Navy warship to receive the Naval Strike Missile |access-date=March 9, 2025}}</ref><ref>{{cite web |date=December 12, 2024 |url=https://www.navylookout.com/royal-navy-frigate-hms-portland-fitted-with-naval-strike-missiles/ |title=Royal Navy frigate HMS Portland fitted with Naval Strike Missiles |website=navylookout.com |access-date=December 13, 2024}}</ref><ref>{{cite tweet |url=https://twitter.com/NavyLookout/status/1736708119323893959?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Etweet|title=@NavyLookout First view of Royal Navy warship equipped with the Naval Strike Missile. |number=1736708119323893959 |user=NavyLookout |author=Navy Lookout |date=18 December 2023 |access-date=18 December 2023}}</ref><ref name="NSM">{{cite news |title=Royal Navy warships to receive Harpoon replacement from next year |url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2022/november/22/20221122-royal-navy-warships-to-receive-harpoon-replacement-from-next-year |access-date=23 November 2022 |agency=[[Royal Navy]] |date=22 November 2022}}</ref>
* Up to one embarked [[AgustaWestland AW159 Wildcat|Agusta Westland AW159 Wildcat]] helicopter equipped with [[Martlet (missile)|Martlet multirole missiles]] (as of 2021) or [[Sea Venom (missile)|Sea Venom anti-ship missiles]] (initial operating capability from October 2025 and full operating capability projected from 2026).<ref>{{cite web|url=https://www.navylookout.com/initial-operating-capability-declared-for-royal-navy-sea-venom-anti-ship-missile/|title=Initial Operating Capability declared for Royal Navy Sea Venom anti-ship missile |website= Navy Lookout |date=2 October 2025 |access-date=2 October 2025}}</ref><ref>{{Cite web|url=https://www.navylookout.com/royal-navys-sea-venom-light-anti-ship-missile-full-operating-capability-delayed-until-2026/|title = Royal Navy's Sea Venom light anti-ship missile full operating capability delayed until 2026 |website=Navy Lookout |date=21 June 2023}}</ref><ref>{{cite web |url=https://www.janes.com/defence-news/news-detail/rn-wildcats-field-new-anti-surface-guided-weapons-for-csg21 |title=RN Wildcats field new anti-surface guided weapons for CSG21 |work=Janes |last=Scott |first=Richard |date=24 May 2021 |access-date=6 November 2021 }}</ref>

===Anti-submarine warfare===
* A [[Thales Underwater Systems]] Type 2050 bow sonar scheduled to be replaced by an [[Ultra Electronics]] Type 2150 next generation ASW bow sonar in due course.{{citation needed|date=December 2018}}
* An [[Ultra Electronics]] [[Sonar 2031|Type 2031Z]] towed sonar initially fit on Type 23 frigates – no longer in RN service.
* A [[Sonar 2087|Type 2087]] towed sonar now fit to eight of the Type 23 frigates (F237, F238, F239, F78, F79, F81, F82, F83).
* 2× twin 12.75 in (324&nbsp;mm) magazine launched torpedo tubes built by SEA Ltd for anti-submarine [[Sting Ray torpedo]]es. The tubes are magazine reloaded.
* Up to one embarked [[AgustaWestland AW159 Wildcat|Agusta Westland AW159 Wildcat]] or one [[AgustaWestland EH101]] Merlin helicopter can be equipped with 2-4× anti-submarine [[Sting Ray torpedo]]es respectively. An embarked Merlin HM2 helicopter is equipped with its own dipping [[sonar]], [[sonobuoys]] and [[radar]]s; For submarine targets, Wildcat relies on the ship's sensors.<ref>{{cite web |url=https://www.savetheroyalnavy.org/in-focus-the-wildcat-multi-role-helicopter-in-service-with-the-royal-navy/ |title=In focus: the Wildcat multi role helicopter in service with the Royal Navy |work=Navy Lookout |date=4 February 2019 |access-date=21 June 2021 }}</ref>

===Guns===
* 1× BAE Systems [[4.5-inch Mark 8 naval gun|4.5 inch Mark 8 naval gun]].
* 2× [[30mm DS30M Mark 2 Automated Small Calibre Gun]]s ''or'' 30mm DS30B guns.
* 2× [[Minigun]]s (replaced by [[Browning .50 caliber machine gun|Browning .50 caliber heavy machine guns]] as of 2023)<ref>{{cite web |url=https://www.navylookout.com/in-focus-the-50-cal-heavy-machine-gun-in-royal-navy-service/ |title=In focus: the 50 cal heavy machine gun in Royal Navy service |publisher=Navy Lookout |date=5 May 2023 |access-date=5 May 2023}}</ref>
* 4× [[General-purpose machine gun]]s.

===Countermeasures===
* The [[Seagnat]] decoy system allows for the seduction and distraction of radar guided weapons, through active and passive means.
* Type 182 towed torpedo decoys.
* Type 2070 towed torpedo [[sonar decoy|decoy]] system.
* Thales defence Scorpion Electronic Counter Measures/UAF-1 ESM Jammer. Used to confuse or block enemy radar making the Type 23 frigate harder to detect and/or lock onto by enemy radar/sonar guided weapons.

===Electronic systems===
* Navigation: [[Kelvin Hughes]] Radar Type 1007 and [[Racal Decca]] Type 1008.
* [[fire-control system]]: Sperry Sea Archer 30 optronic surveillance/director'
* Combat Management System: [[BAE Systems]] Command System DNA(2)'<ref>{{cite web |url=https://www.theregister.co.uk/2009/01/05/windows_for_warships_hits_type_23s/ |title=Windows for Warships™ reaches Royal Navy frigates |first=Lewis |last=Page |date=5 January 2009 |website=[[The Register]] |access-date=3 August 2016}}</ref>

===Additional capabilities===
* The Type 23 frigates have sufficient space to embark a small detachment of [[Royal Marines]] and their equipment.{{Citation needed|date=September 2025}}

==Ships==
[[File:HMS Westminster moored at South Quay.jpg|thumb|HMS ''Westminster'' moored at South Quay in London]]
Although the Type 23 is officially the "Duke" class, and includes such famous names as HMS ''Iron Duke'' (which had been the name of the battleship {{HMS|Iron Duke|1912|6}}, Admiral [[John Jellicoe, 1st Earl Jellicoe|Jellicoe's]] [[flagship]] at the [[Battle of Jutland]]), five of the names had previously been used on classes known as the "County class": ''Kent'' and ''Norfolk'' were names given both to 1960s [[County-class destroyer|guided-missile destroyers]] and Second World War-era [[County-class cruiser|County-class heavy cruisers]], while ''Monmouth'', ''Lancaster'', ''Kent'' and ''Argyll'' revived names carried by First World War-era [[Monmouth-class cruiser|''Monmouth''-class armoured cruisers]]. This use of Ducal and County names broke a tradition of [[Naming conventions for destroyers of the Royal Navy|alphabetical names for escort ships]] which had run in two – not unbroken – cycles from the [[Laforey-class destroyer (1913)|L-class destroyers]] of 1913 to the {{sclass|Daring|destroyer|1||1949}}s of 1950; this progression was revived with the ''Amazon''-class [[Type 21 frigate]]s of 1972–1975, and continued with B and C names for most of the Type 22 frigates of 1976–1989. However, the D names have since been used for the new [[Type 45 destroyer|Type 45 ''Daring''-class]] destroyers.

On 21 July 2004, in the [[Delivering Security in a Changing World]] review of defence spending, Defence Secretary [[Geoff Hoon]] announced that ''Norfolk'', {{HMS|Marlborough|F233|2}} and {{HMS|Grafton|F80|2}} were to be paid off. In 2005 it was announced that these three vessels would be sold to the [[Chilean Navy]], to be delivered in 2008. In September 2005 BAE Systems was awarded a £134&nbsp;million GBP contract to prepare the frigates for transfer. ex-''Marlborough'', ex-''Norfolk'' and ex-''Grafton'' were sold to Chile for a total of £134&nbsp;million. The letter of intent for purchase was signed in December 2004, followed by a formal contract on 7 September 2005.<ref name=Janes08p111>{{cite book |title=Jane's Fighting Ships 2008–2009 |editor-last=Saunders |editor-first=Stephen |date=2008 |publisher=Jane's Information Group |isbn=978-0-7106-2845-9 |page=111}}</ref> ex-''Norfolk'' was handed over by the [[Defence Logistics Organisation]] and BAE Systems and commissioned into the Chilean Navy on 22 November 2006, and named ''Almirante Cochrane'' (FF-05) (after [[Thomas Cochrane, 10th Earl of Dundonald|Lord Cochrane]], a naval hero to both the British and Chileans). Ex-''Grafton'' was delivered to Chilean Navy on 28 March 2007 at Portsmouth and renamed ''Almirante Lynch'' (FF-07). Ex-''Marlborough'' was delivered to Chilean Navy on 28 May 2008 at Portsmouth and renamed ''Almirante Condell'' (FF-06).{{citation needed|date=March 2021}} {{As of|2021}}, these three ships remain in service with the Chilean Navy and were upgraded by Lockheed Martin Canada by the local [[ASMAR]] shipbuilding company.<ref>{{Cite news|first=Richard|last=Scott|date=6 January 2021|title=Work continues on Chilean Type 23 frigate upgrade programme|url=https://www.janes.com/defence-news/news-detail/work-continues-on-chilean-type-23-frigate-upgrade-programme|access-date=8 March 2021|website=Janes|language=en}}</ref>

The two oldest ships in Royal Navy service are classified as General Purpose ships, and are primarily homeported at Portsmouth. The remainder are equipped with the Type 2087 Towed Array Sonar, and are primarily tasked with the anti-submarine warfare mission. These seven ships are based primarily at Devonport.<ref>{{cite web |url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2017/november/24/171124-defence-secretary-announces-type-23-base-port-moves |title=Defence Secretary announces Type 23 base port moves |author=<!--Not stated--> |date=24 November 2017 |website=Royal Navy |access-date=12 August 2019 }}</ref> The Type 23 ships in the Royal Navy are due to be replaced in service by the [[Type 26 frigate|Type 26]] ASW and [[Type 31 frigate|Type 31]] general purpose frigates.<ref>{{cite web |url=https://www.forces.net/stories/comment-dilemma-behind-navys-type-26-and-type-31-frigates |title=The Dilemma Behind The Navy's Type 26 And Type 31 Frigates |last=Charlie |first=Lima |date=5 September 2018 |website=forces.net |access-date=3 December 2019 }}</ref> The 2021 defence white paper indicated that both ''Montrose'' and ''Monmouth'' would be withdrawn early. ''Monmouth'', having had the planned life-extension refit cancelled, and been laid up since 2018, was withdrawn from service in June 2021.<ref name=ukdjmarch/> In 2024, it was indicated that both HMS ''Westminster'' and HMS ''Argyll'' would also be retired.<ref>{{Cite web |last=Allison |first=George |date=2024-05-14 |title=Two Royal Navy frigates to be retired|url=https://ukdefencejournal.org.uk/two-royal-navy-frigates-to-be-retired/ |access-date=2024-05-14 |work=UK Defence Journal |language=en-GB |issn=0307-1235}}</ref> In 2021 in a written answer provided to the House of Commons Select Defence Committee, the First Sea Lord, Admiral Tony Radakin, suggested that older frigates of the class would be retained in service longer than anticipated in order to ensure that escort numbers did not fall below 17 ships (6 destroyers and 11 frigates) and start to rise above 19 escorts beginning in 2026. However, personnel shortages and the age of some ships ended up making this cost prohibitive.<ref>{{cite web |url=https://ukdefencejournal.org.uk/royal-navy-escort-fleet-to-return-above-19-warships-by-2026/ |title=Royal Navy escort fleet to 'return above 19' warships by 2026 |work=UK Defence Journal |last=Allison |first=George |date=24 November 2021 |access-date=26 November 2021 }}</ref> In November 2024, the newly elected Labour government indicated that HMS ''Northumberland'' would also be withdrawn from service by March 2025.<ref>{{cite web |url=https://www.bbc.com/news/articles/c2k0292v0w1o |title=UK to decommission ships, drones and helicopters to save £500m |website=BBC |last=Vock |first=Ido |date=20 November 2024}}</ref>

{| class="wikitable sortable"
|-
! Name
! [[Pennant number|Pennant No.]]
! Type
! Builder
! Laid down
! Launched
! Commissioned
! Mid-life upgrade
! Decommissioned
! Status
|-
! colspan=10 | {{RN}}
|-
| {{HMS|Norfolk|F230|2}}
| F230
|
| Marconi Marine (YSL), Scotstoun
| 14 December 1985<ref name=Conwaysp525/>
| 10 July 1987<ref name=Conwaysp525/>
| 1 June 1990<ref name=Conwaysp525/>
| {{n/a}}
| 15 April 2005
| Sold to Chile as ''Almirante Cochrane''
|-
| {{HMS|Marlborough|F233|2}}
| F233
|
| Swan Hunter, Wallsend
| 22 October 1987<ref name=Conwaysp525/>
| 21 January 1989<ref name=Conwaysp525/>
| 14 June 1991<ref name=Conwaysp525/>
| {{n/a}}
| 8 July 2005
| Sold to Chile as ''Almirante Condell''
|-
| {{HMS|Argyll|F231|2}}
| F231
| GP
| [[Yarrow Shipbuilders|Marconi Marine (YSL)]], [[Scotstoun]]
| 20 March 1987<ref name=Conwaysp525>{{cite book |editor-last=Gardiner |editor-first=Robert |date=1995 |title=Conway's All the World's Fighting Ships 1947–1995 |url=https://archive.org/details/conwaysallworlds00gard |url-access=limited |publisher=Conway Maritime Press |page=[https://archive.org/details/conwaysallworlds00gard/page/n540 525] |isbn=0-85177-605-1}}</ref>
| 8 April 1989<ref name=Conwaysp525/>
| 31 May 1991<ref name=Conwaysp525/>
| Jun 2015 to Feb 2017<ref name=report2020/>
| May 2024
| Awaiting disposal<ref>{{cite tweet |url=https://x.com/NavyLookout/status/1967945258823753974?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Etweet |title=@NavyLookout ex-HMS Argyll leaves Devonport for the final time - being towed to Portsmouth to be prepared for disposal. |number=1967945258823753974 |user=NavyLookout |date=16 September 2025 |access-date=18 September 2025}}</ref><ref name=argyllwestminster>{{Cite web |last=Allison |first=George |date=2024-05-14 |title=Two Royal Navy frigates to be retired|url=https://ukdefencejournal.org.uk/two-royal-navy-frigates-to-be-retired/ |access-date=2024-05-14 |work=UK Defence Journal |language=en-GB}}</ref>
|-
| {{HMS|Lancaster|F229|2}}
| F229
| GP
| Marconi Marine (YSL), Scotstoun
| 18 December 1987<ref name=Conwaysp525/>
| 24 May 1990<ref name=Conwaysp525/>
| 1 May 1992<ref name=Janes08p862>{{cite book |title=Jane's Fighting Ships 2008–2009 |editor-last=Saunders |editor-first=Stephen |date=2008 |publisher=Jane's Information Group |isbn=978-0-7106-2845-9 |page=862}}</ref>
| March 2017 – December 2019<ref name=report2020/>
| 6 December 2025<ref>{{cite web|title=https://www.royalnavy.mod.uk/news/2025/december/05/20251205-hms-lancaster-bows-out-after-34-years-of-distinguished-service}</ref>
| Awaiting disposal<ref>{{cite web |url=https://www.navylookout.com/hms-lancaster-to-be-decomissioned-in-bahrain/|title=HMS Lancaster to be decommissioned in Bahrain |date=5 December 2025 |website=Navy Lookout |access-date=5 December 2025 }}</ref><ref>{{cite web | url=https://ukdefencejournal.org.uk/snapshot-of-the-status-of-the-british-fleet/ | title=Snapshot of the status of the British fleet | date=27 April 2024 }}</ref>
|-
| {{HMS|Iron Duke|F234|2}}
| F234
| GP
| Marconi Marine (YSL), Scotstoun
| 12 December 1988<ref name=Conwaysp525/>
| 2 March 1991<ref name=Conwaysp525/>
| 20 May 1993<ref name=Conwaysp525/>
| From January 2019 - June 2023
| 
| In Active Service
|-
| {{HMS|Monmouth|F235|2}}
| F235
| GP
| Marconi Marine (YSL), Scotstoun
| 1 June 1989<ref name=Conwaysp525/>
| 23 November 1991<ref name=Conwaysp525/>
| 24 September 1993<ref name=Conwaysp525/>
| {{n/a}}
| 30 June 2021<ref>{{cite web |last1=Allison |first1=George |title=Frigate HMS Monmouth cut from Royal Navy fleet |url=https://ukdefencejournal.org.uk/frigate-hms-monmouth-cut-from-royal-navy-fleet/ |website=ukdefencejournal.org.uk |publisher=[[UK Defence Journal]] |access-date=1 June 2023 |archive-url=https://web.archive.org/web/20210727072815/https://ukdefencejournal.org.uk/frigate-hms-monmouth-cut-from-royal-navy-fleet/ |archive-date=2021-07-27 |language=en |date=July 27, 2021 |url-status=live}}</ref>
| Sold for scrap<ref>{{cite web |author=<!-- not stated --> |date=3 April 2025 |title=Farewell HMS Monmouth – first of the Type 23 frigates to be scrapped is towed away |url=https://www.navylookout.com/farewell-hms-monmouth-first-of-the-type-23-frigates-to-be-scrapped-is-towed-away/ |website=Navy Lookout |location= |publisher= |access-date=3 April 2025}}</ref>
|-
| {{HMS|Montrose|F236|2}}
| F236
| GP
| Marconi Marine (YSL), Scotstoun
| 1 November 1989<ref name=Conwaysp525/>
| 31 July 1992<ref name=Conwaysp525/>
| 2 June 1994<ref name=Janes08p862/>
| October 2014 – July 2017<ref name=report2020/>
| 17 April 2023 <ref>{{cite web |title=Montrose Decommissioned |url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2023/april/17/20230417-montrose-decommissioned}}</ref>
| Awaiting disposal<ref>{{cite web |url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2023/april/17/20230417-montrose-decommissioned |title=Navy bids farewell to 'a fine ship' as stalwart frigate HMS Montrose is retired |author=<!--Not stated--> |date=17 April 2023 |website=Royal Navy |publisher= |access-date=17 April 2023 |quote=}}</ref>
|-
| {{HMS|Westminster|F237|2}}
| F237
| ASW
| [[Swan Hunter]], [[Wallsend]]
| 18 January 1991<ref name=Conwaysp525/>
| 4 February 1992<ref name=Janes08p862/>
| 13 May 1994<ref name=Conwaysp525/>
| November 2014 – January 2017<ref name=report2020/>
| May 2024
| Awaiting disposal<ref name=argyllwestminster />
|-
| {{HMS|Northumberland|F238|2}}
| F238
| ASW
| Swan Hunter, Wallsend
| 4 April 1991<ref name=Conwaysp525/>
| 4 April 1992<ref name=Conwaysp525/>
| 29 November 1994<ref name=Janes08p862/>
| May 2016 – May 2018<ref name=report2020/>
| 12 March 2025<ref>{{cite web |url=https://www.bbc.com/news/articles/c2k0292v0w1o |title=UK to decommission ships, drones and helicopters to save £500m |website=BBC |last=Vock |first=Ido |date=20 November 2024}}</ref>
| Awaiting disposal
|-
| {{HMS|Richmond|F239|2}}
| F239
| ASW
| Swan Hunter, Wallsend
| 16 February 1992<ref name=Janes08p862/>
| 6 April 1993<ref name=Conwaysp525/>
| 22 June 1995<ref name=Janes08p862/>
| August 2017 – February 2020<ref name=report2020/>
|
| In Active Service
|-
| {{HMS|Somerset|F82|2}}
| F82
| ASW
| Marconi Marine (YSL), Scotstoun
| 12 October 1992<ref name=Conwaysp525/>
| 25 June 1994<ref name=Conwaysp525/>
| 20 September 1996<ref name=Janes08p862/>
| November 2018 – March 2022<ref name=report2020/>
|
| In Active Service
|-
| {{HMS|Grafton|F80|2}}
| F80
| 
| Marconi Marine (YSL), Scotstoun
| 13 May 1993<ref name=Conwaysp525/>
| 5 November 1994<ref name=Conwaysp525/>
| 29 May 1997<ref name=Conwaysp525/>
| {{n/a}}
| 31 March 2006
| Sold to Chile as ''Almirante Lynch''
|-
| {{HMS|Sutherland|F81|2}}
| F81
| ASW
| Marconi Marine (YSL), Scotstoun
| 14 October 1993<ref name=Conwaysp525/>
| 9 March 1996<ref name=Conwaysp525/>
| 4 July 1997<ref name=Janes08p862/>
| December 2020 - March 2024<ref name=report2020/><ref>{{cite web | url=https://www.royalnavy.mod.uk/news-and-latest-activity/news/2024/march/15/20240315-final-frigate-revamp-passes-key-milestone-as-hms-sutherland-returns-to-the-water | title=Final frigate revamp passes key milestone as HMS Sutherland returns to the water |work=Royal Navy |date=15 March 2024 |access-date=25 March 2024}}</ref>
|
| In Active Service<ref name="hansard.28004">{{cite hansard |title=Written question: Type 23 Frigates |url=http://www.parliament.uk/business/publications/written-questions-answers-statements/written-question/Commons/2016-02-23/28004/ |house=House of Commons |date=1 March 2016 |speaker=[[Philip Dunne (Ludlow MP)|Philip Dunne]] |position=Minister for Defence Procurement}}</ref>
|-
| {{HMS|Kent|F78|2}}
| F78
| ASW
| Marconi Marine (YSL), Scotstoun
| 16 April 1997<ref name=Janes08p862/>
| 27 May 1998<ref name=Janes08p862/>
| 8 June 2000<ref name=Janes08p862/>
| January 2017 – August 2018<ref name=report2020/>
|
| Refit at Devonport<ref>{{cite web | url=https://ukdefencejournal.org.uk/snapshot-of-the-status-of-the-british-fleet/ | title=Snapshot of the status of the British fleet | date=27 April 2024 }}</ref>
|-
| {{HMS|Portland|F79|2}}
| F79
| ASW
| Marconi Marine (YSL), Scotstoun
| 14 January 1998<ref name=Janes08p862/>
| 15 May 1999<ref name=Janes08p862/>
| 3 May 2001<ref name=Janes08p862/>
| February 2018 – March 2021<ref name=report2020/>
|
| In Active Service<ref name="hansard.28004"/>
|-
| {{HMS|St Albans|F83|2}}
| F83
| ASW
| Marconi Marine (YSL), Scotstoun
| 18 April 1999<ref name=Janes08p862/>
| 6 May 2000<ref name=Janes08p862/>
| 6 June 2002<ref name=Janes08p862/>
| July 2019 – November 2023<ref>{{Cite web |last=Ainsworth |first=Clare |date=2023-11-15 |title=Royal Navy ship preparing to return to sea after four-year refit |url=https://www.plymouthherald.co.uk/news/plymouth-news/royal-navy-ship-hms-st-8909168 |access-date=2023-11-15 |website=Plymouth Live |language=en}}</ref>
|
| In Active Service<ref name="hansard.28004"/>
|-
! colspan=10 | {{navy|Chile}}
|-
| ''Almirante Cochrane''
| FF05
| ASW
| Marconi Marine (YSL), Scotstoun
| 14 December 1985<ref name=Conwaysp525/>
| 10 July 1987<ref name=Conwaysp525/>
| 22 November 2006
| March 2018 to November 2019<ref name="García">{{cite web |url=https://www.infodefensa.com/texto-diario/mostrar/3247172/asmar-entrega-armada-chile-ultima-fragata-type-23-modernizada |title=Asmar entrega a la Armada de Chile la última fragata Type 23 modernizada |work=infodefensa.com |language=es |last=García |first=Nicolás |date=25 October 2021 |access-date=26 November 2021 }}</ref>
|
| In active service
|-
| ''Almirante Condell''
| FF06
| ASW
| Swan Hunter, Wallsend
| 22 October 1987<ref name=Conwaysp525/>
| 21 January 1989<ref name=Conwaysp525/>
| 28 May 2008
| September 2020 to October 2021<ref name="García"/>
|
| In active service
|-
| ''Almirante Lynch''
| FF07
| ASW
| Marconi Marine (YSL), Scotstoun
| 13 May 1993<ref name=Conwaysp525/>
| 5 November 1994<ref name=Conwaysp525/>
| 28 March 2007
| June 2019 to December 2020<ref name="García"/>
|
| In active service
|}

==Operational history==

In April 2003 Richmond was one of 3 Royal Navy warships (2 x Type 23 and 1 x Type 22 frigates) on the gun line for the Al Faw assault, undertaking Naval Gunfire Support (NGS) for allied troops as they entered Iraq. 

In 2011, {{HMS|Iron Duke|F234|6}} destroyed a gun battery outside the besieged city of [[Misrata]], [[Libya]]. She also fired [[star shell]]s into the night sky to illuminate [[Gaddafi loyalism|pro-Gaddafi]] positions to allow [[NATO]] aircraft to destroy them.<ref>{{cite news |date=7 March 2012 |url=https://www.gov.uk/government/news/hms-iron-duke-honoured-for-efficiency-on-operations |title=HMS Iron Duke honoured for efficiency on operations |publisher=Government of the United Kingdom |author=Ministry of Defence |access-date=1 January 2024}}</ref><ref>{{cite magazine |date=September 2011 |url=https://www.royalnavy.mod.uk/-/media/royal-navy-responsive/images/navynews/archivepdfs/2010s/2011/navy-news-september-2011-issue-686.pdf?rev=51604b8857d14e6889909c4407d3bf89 |title=Global Reach |magazine=[[Navy News]] |page=4 |access-date=1 January 2024}}</ref>

On the 9th March 2024 {{HMS|Richmond|F239|2}} used its [[CAMM (missile family)|Sea Ceptor]] missiles to shoot down two attack drones. This was the first use of [[CAMM (missile family)|Sea Ceptor]] in operational circumstances by the class.<ref>{{cite web |last1=sandman |first1=Pete |title=Navy Lookout |url=https://www.navylookout.com/first-kills-for-sea-ceptor-hms-richmond-downs-2-attack-drones/ |website=Navy Lookout |date=9 March 2024 }}</ref>

==In fiction==
* {{HMS|Westminster|F237|6}} was used for the Type 23 interior shots in the [[James Bond]] film ''[[Tomorrow Never Dies]]'' in three different roles as HMS ''Chester'', HMS ''Devonshire'' and HMS ''Bedford''. For the exterior shots a Type 23 model was constructed.
* The [[ITV (TV network)|ITV]] series ''[[Making Waves (TV series)|Making Waves]]'' was set aboard the Type 23 frigate HMS ''Suffolk'' (which was portrayed by {{HMS|Grafton|F80|6}}).
* {{HMS|Montrose|F236|6}} and {{HMS|Monmouth|F235|6}} were used to portray the interior and exterior shots of the fictional HMS ''Monarch'' for the film ''Command Approved''<ref>{{cite web |url=https://www.imdb.com/title/tt0234321/ |title=Command Approved |date=1 January 2000 |website=[[IMDb]] |access-date=3 August 2016}}</ref> which is the centre piece of ''Action Stations'' at [[Portsmouth Historic Dockyard#Portsmouth Historic Dockyard|Portsmouth Historic Dockyard]], Portsmouth, England.
* The fictional HMS ''Beaufort'' is the centrepiece of British author [[Mike Lunnon-Wood]]'s novel ''King's Shilling''. In it, HMS ''Beaufort'' is tasked to evacuate the British embassy and citizens in the [[Liberia]]n capital [[Monrovia]] during the [[First Liberian Civil War|1990s civil war]].
* The [[TNT (U.S. TV network)|TNT]] series ''[[The Last Ship (TV series)|The Last Ship]]'' featured a Chilean Duke-class frigate in the fourth episode of its fifth season, charging an {{sclass|Arleigh Burke|destroyer|2}} and landing a hit with one of four [[Sea Wolf (missile)|Sea Wolf]] missiles.

==See also==
* [[List of naval ship classes in service]]

==References==
{{Reflist}}

===Bibliography===
*{{cite book |title=The Encyclopedia of Warships, From World War Two to the Present Day |editor-last=Jackson |editor-first=Robert |date=2006 |location=San Diego, CA |publisher=[[Thunder Bay Press]] |isbn=978-1-59223-627-5}}

==External links==
{{Commons|Type 23 frigate}}
*{{cite web |url=http://www.royalnavy.mod.uk/the-equipment/ships/frigates/type-23-frigate |title=Type 23 Frigate |website=Royal Navy}}
*{{cite web |url=http://www.armedforces.co.uk/navy/listings/l0016.html |title=Type 23 Duke Class Frigate |website=Armedforces.co.uk}}

{{Type 23 frigate}}
{{Royal Navy ships}}
{{Chilean frigates (Modern Era)}}

{{DEFAULTSORT:Type 23 Frigate}}
[[Category:Frigates of the United Kingdom]]
[[Category:Frigate classes]]
[[Category:Ship classes of the Royal Navy]]
[[Category:Type 23 frigates| ]]
[[Category:CODLAG ships]]