HMS Iron Duke (F234)
   HOME

TheInfoList



OR:

HMS ''Iron Duke'' is a
Type 23 frigate The Type 23 frigate or Duke class is a class of frigates built for the United Kingdom's Royal Navy. The ships are named after British Dukes, thus leading to the class being commonly known as the Duke class. The first Type 23, , was commission ...
of the
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
, and the third ship to bear the name. ''Iron Duke'' has intercepted several large consignments of
illegal drug The prohibition of drugs through sumptuary legislation or religious law is a common means of attempting to prevent the recreational use of certain intoxicating substances. An area has a prohibition of drugs when its government uses the for ...
s being sent from the
Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
to Europe. In her only combat mission, she was in action off Libya in 2011, destroying a gun battery outside the besieged town of
Misrata Misrata ( ; , Libyan Arabic: ; also spelled Misratah and known by the Italian spelling Misurata) is a city in northwestern Libya located in the Misrata District, situated to the east of Tripoli on the Mediterranean coast near Cape Misrata. ...
. She also fired star shells through the night to illuminate pro-Gaddafi positions for NATO aircraft to destroy rocket launchers, fuel dumps, ammo stores, artillery batteries and command and control centres, whilst also confirming that no civilians were in the area.


Commissioning and construction

''Iron Duke'' was launched on 2 March 1991 by Lady Jane King in the presence of the
Duke Duke is a male title either of a monarch ruling over a duchy, or of a member of Royal family, royalty, or nobility. As rulers, dukes are ranked below emperors, kings, grand princes, grand dukes, and above sovereign princes. As royalty or nobi ...
and Duchess of Wellington. Her affiliated town is
Kingston upon Hull Kingston upon Hull, usually shortened to Hull, is a historic maritime city and unitary authorities of England, unitary authority area in the East Riding of Yorkshire, England. It lies upon the River Hull at its confluence with the Humber Est ...
, and she is named after Arthur Wellesley, the first
Duke of Wellington Duke is a male title either of a monarch ruling over a duchy, or of a member of royalty, or nobility. As rulers, dukes are ranked below emperors, kings, grand princes, grand dukes, and above sovereign princes. As royalty or nobility, they ar ...
(the "Iron Duke"). She was the fifth Duke-class Type 23 frigate to be launched for the Royal Navy, at a cost of £140 million. The motto of ''Iron Duke'' is ''Virtutis Fortuna Comes'' (
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
: "Fortune is the companion of valour") – inherited from the
33rd (The Duke of Wellington's) Regiment of Foot The Duke of Wellington's Regiment (West Riding) was a line infantry regiment of the British Army, forming part of the King's Division. In 1702, Colonel George Hastings, 8th Earl of Huntingdon, was authorised to raise a new regiment, which he di ...
. ''Iron Duke'' carries a number of weapons and sensors which make her a multi-purpose combat vessel. Like all T23s, her original design role was
anti-submarine warfare Anti-submarine warfare (ASW, or in the older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations ar ...
, but she can be employed in a variety of roles. She carries a Wildcat Helicopter which can be used in an anti-submarine and anti-surface role as well as for humanitarian and
search and rescue Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...
purposes. The ship, like her sisters HMS Monmouth,
HMS Montrose HMS ''Montrose'' has been the name of two ships of the United Kingdom's Royal Navy: * , a ''Scott''-class (or Admiralty-type) destroyer leader that served throughout World War II and was scrapped in 1946. * , a Type 23 frigate launched in 1992 and ...
,
HMS Lancaster There have been six ships of the Royal Navy named HMS ''Lancaster'': * was an 80-gun first rate built in 1694, then rebuilt and relaunched in 1722, and rebuilt for a third time to a 66-gun third rate in 1749. * was an East Indiaman, fitted out ...
and HMS Argyll, did not receive the new
Sonar 2087 The Sonar 2087 (sometimes shortened to S2087) is a towed array sonar developed by Thales Underwater Systems (TUS). Manufactured in the United Kingdom, it is the British variant of the company's CAPTAS-4 manufactured in Brest, France, and part of i ...
upgrade that other frigates of the class subsequently received. Therefore she has been regarded as a "general purpose" frigate without the more specialized anti-submarine capability of the other eight ships in the Type 23 fleet. However, on the retirement of HMS Westminster in 2024, it was reported that the S2087 towed array from that ship might now be fit to ''Iron Duke'' instead, though it remained unconfirmed whether this would actually occur. ''Iron Duke'' was the First of Class fit for the Royal Navy's new Type 997 Artisan 3D, successfully firing her missile system, using the new radar combined with the updated 'SWMLU' Seawolf missile targeting system, in the English Channel.


Operational history


1993–2000

In 2000, under the command of Commander Ben Key for Atlantic Patrol Tasking (South), ''Iron Duke'' was part of the
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
task force—comprising , , , , and four
RFA RFA may refer to: Groups, organizations * Radio Free Asia, a private news broadcaster and publisher in East Asia, funded in part by the U.S. government * Renewable Fuels Agency, a former UK renewable fuel regulatory agency * Renewable Fuels A ...
ships—that deployed to
Sierra Leone Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is . It has a tropical climate and envi ...
during the civil war there. ''Iron Duke'' relieved ''Argyll'' of her duties in September. During this incident ''Argyll'', assisted by ''Ocean'', laid the foundation for the Iron Duke Community School;a school for orphans in Freetown. President Kabbah of
Sierra Leone Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is . It has a tropical climate and envi ...
decreed the school be named after the ''Iron Duke'' in honour of their crew completing the construction of the six classrooms. During this deployment ''Iron Duke'' also visited the Falkland Islands, Brazil, Ghana, Senegal and attended Exponaval 2000 when she made a good will visit to Valparaiso, Chile, to help improve relations with the UK's traditional ally. This was the RN's first visit since the General Pinochet affair.


2001–2010

In May 2002 ''Iron Duke'' re-entered service after a refit, armed with a new 4.5 inch Mod 1 gun. Under the command of Commander Phil Warwick, ''Iron Duke'' sailed into Portsmouth for her re-dedication. Amongst those in attendance were the present Duke of Wellington and Earl Jellicoe, both related to figures associated with the ship's name and career. The following January ''Iron Duke'' deployed to the Caribbean for counter-drugs operations, hurricane season disaster relief standby, and visiting UK Overseas Territories for diplomatic purposes. This was the frigate's first operation since completing her refit at the end of 2001 and comprehensive training including multi-national exercises off Scotland. In February 2006 ''Iron Duke'' conducted trials in
Loch Goil Loch Goil; () is a small sea loch forming part of the coast of the Cowal peninsula in Argyll and Bute, Scotland. The sea loch is entirely within the Loch Lomond and The Trossachs National Park. It is an arm of Loch Long. The village of Lochg ...
and
Loch Fyne Loch Fyne (, ; meaning "Loch of the Vine/Wine"), is a sea loch off the Firth of Clyde and forms part of the coast of the Cowal, Cowal Peninsula. Located on the west coast of Argyll and Bute, west of Scotland. It extends inland from the Sound o ...
. In September 2006 ''Iron Duke'', under Commander Andy Jordan, was providing a presence for UK overseas territories in the
Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
and providing the UK contribution to the war on drugs. She returned to the UK in December 2006. During her six-month deployment, ''Iron Duke'' steamed over , and made 22 port visits to 18 different locations. In 2007 ''Iron Duke'', now under the command of Commander Andy Gurr, was dry-docked for ten months at HMNB Portsmouth. Various systems were upgraded including the anti-submarine warfare equipment, and the ability to operate the Merlin helicopter was added. The first installation of a NATO Radial Chemical, Biological, Radioactive, Nuclear filter system was made; this filter was undergoing trials prior to installation across the fleet, if successful. After 18 months of refit and upgrading, by March 2008 ''Iron Duke'' was halfway through her Operational Sea Training, in readiness for deployment to the North Atlantic at the end of May. All aspects of warfare were included in the training, including the infamous '
Thursday War A Thursday War is the colloquial name given in the Royal Navy for the weekly war-fighting and damage control exercises that are held during Fleet Operational Sea Training (FOST), so named because they are usually held on a Thursday. FOST is respo ...
' training exercise. On 18 April 2008 ''Iron Duke'' deployed to Avonmouth to train in sea and harbour safety. Avon and Somerset Police assisted in training in the co-operation between the Royal Navy and uniformed police in the event of harbour security being breached. Civic dignitaries also viewed the ship. Later in April the ''Iron Duke''s Operational Sea Training increased in difficulty with a simulation of tension between Brownian and Ginger forces with negotiations in neutral Freeport (Devonport) and a high risk of terrorist attacks. This exercise tested the defensive capabilities of the ship and the flexibility of proportional response to threats. Later in the series of exercises a hurricane hit the simulated island of Bullpoint, allowing ''Iron Duke'' to test her disaster relief capabilities including first aid, providing food and shelter to the survivors and helping to rebuild basic amenities. ''Iron Duke'' visited her home town,
Kingston upon Hull Kingston upon Hull, usually shortened to Hull, is a historic maritime city and unitary authorities of England, unitary authority area in the East Riding of Yorkshire, England. It lies upon the River Hull at its confluence with the Humber Est ...
, over the weekend of 26 to 29 April 2008 and was open to the public for six hours. By Friday 13 June ''Iron Duke'' arrived in
Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...
,
Portugal Portugal, officially the Portuguese Republic, is a country on the Iberian Peninsula in Southwestern Europe. Featuring Cabo da Roca, the westernmost point in continental Europe, Portugal borders Spain to its north and east, with which it share ...
after two operational stand-offs to determine that she was ready to deploy operationally. ''Iron Duke'' was briefed by the Maritime Analysis and Operations Centre-Narcotics, a pan-European counter-narcotics agency, about intelligence on criminal matters such as cannabis and cocaine smuggling on the high seas. She then moved to
Gibraltar Gibraltar ( , ) is a British Overseas Territories, British Overseas Territory and British overseas cities, city located at the southern tip of the Iberian Peninsula, on the Bay of Gibraltar, near the exit of the Mediterranean Sea into the A ...
for re-supply and the infamous Rock Run. ''Iron Duke'' was now on Maritime Security Patrol in the North Atlantic. As of 31 August 2008 ''Iron Duke'' was dispatched to assist relief efforts for the Atlantic
Hurricane Gustav Hurricane Gustav () was the second most destructive tropical cyclone of the 2008 Atlantic hurricane season. The seventh tropical cyclone, third hurricane, and second major hurricane of the season, Gustav caused serious damage and Casualty (per ...
. ''Iron Duke'' has intercepted illegal drugs being shipped from the Caribbean to Europe on several occasions, sometimes aided by embarked
United States Coast Guard The United States Coast Guard (USCG) is the maritime security, search and rescue, and Admiralty law, law enforcement military branch, service branch of the armed forces of the United States. It is one of the country's eight Uniformed services ...
personnel Employment is a relationship between two parties regulating the provision of paid labour services. Usually based on a contract, one party, the employer, which might be a corporation, a not-for-profit organization, a co-operative, or any othe ...
. Large shipments were intercepted on 25 June 2003 (3.7 tonnes of cocaine on MV ''Yalta''), 2 June 2008 (900 kilograms of cocaine in a speedboat which later sank), late July 2009 (drugs with a street value of £33 million on a speedboat later sunk by gunfire). and September 2009 (5.5 tonnes of cocaine).


2011–present

''Iron Duke'' spent the first half of 2011 in the Persian Gulf before relieving off the coast
Libya Libya, officially the State of Libya, is a country in the Maghreb region of North Africa. It borders the Mediterranean Sea to the north, Egypt to Egypt–Libya border, the east, Sudan to Libya–Sudan border, the southeast, Chad to Chad–L ...
where she took part in combat operations for the first time in her 20-year history. She entered the Joint Operating Area on 16 July 2011 and over the course of the next five days, she went to Action Stations several times to support operations ashore. She was responsible for the destruction of a gun battery outside the besieged town of
Misrata Misrata ( ; , Libyan Arabic: ; also spelled Misratah and known by the Italian spelling Misurata) is a city in northwestern Libya located in the Misrata District, situated to the east of Tripoli on the Mediterranean coast near Cape Misrata. ...
, while the frigate’s 4.5-inch gun fired many illuminating starshells to light up targets for NATO planes. She returned to Portsmouth in late July, in a joint homecoming with her sister ship The Royal Navy's next generation helicopter,
Wildcat The wildcat is a species complex comprising two small wild cat species: the European wildcat (''Felis silvestris'') and the African wildcat (''F. lybica''). The European wildcat inhabits forests in Europe, Anatolia and the Caucasus, while th ...
, completed 20 days of demanding trials aboard ''Iron Duke'', her first frigate, in January 2012. In March 2012 ''Iron Duke'' began a major refit in HM Naval Base, Portsmouth. Some major parts of the work package took place for the first time on a Type 23 class of ship, as the MOD looks to extend the life of the Type 23 frigates beyond the original time frame to coincide with the introduction of the Type 26 class of ships, the first which is currently expected to enter service as soon as possible after 2020. Also included in the refit was the installation of BAE Systems Artisan medium-range 3D surveillance radar and in June 2013 she was put back at sea. She test fired 7.62mm rounds from her General Purpose Machine Guns and Mini-Guns, 3lb ceremonial guns and the torpedo system. In early 2014, she successfully fired her new 'SWMLU' Seawolf missile system against towed targets, destroying two simulated hostile aircraft skimming the surface of the sea, targeting from the brand new 3D radar system. On 20 June 2014, ''Iron Duke'' deployed on operations for the first time since her refit. The frigate will sail down the Atlantic, gradually working its way down south via the west coast of Africa to the
British Overseas Territories The British Overseas Territories (BOTs) or alternatively referred to as the United Kingdom Overseas Territories (UKOTs) are the fourteen dependent territory, territories with a constitutional and historical link with the United Kingdom that, ...
in the region. It is a routine deployment known as Atlantic Patrol Tasking (South). On 20 August 2014, ''Iron Duke'' received a 21 gun salute as she approached
Robben Island Robben Island () is an island in Table Bay, 6.9 kilometres (4.3 mi) west of the coast of Bloubergstrand, north of Cape Town, South Africa. It takes its name from the Dutch language, Dutch word for seals (''robben''), hence the Dutch/Afrika ...
to dock at the
V&A Waterfront The V&A Waterfront, often referred to as The Waterfront and The V&A, is a mixed-use suburb in Cape Town, South Africa, featuring upmarket residential apartments, a major shopping mall, a marina, and multiple large hotels. The Waterfront sit ...
in
Cape Town Cape Town is the legislature, legislative capital city, capital of South Africa. It is the country's oldest city and the seat of the Parliament of South Africa. Cape Town is the country's List of municipalities in South Africa, second-largest ...
,
South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
. In January 2016, ''Iron Duke'' sailed on a six-month deployment including being tasked to
Standing NATO Maritime Group 1 Standing NATO Maritime Group One (SNMG1) is one of NATO's standing naval maritime immediate reaction forces. SNMG1 consists of four to six destroyers and frigates. Its role is to provide NATO with an immediate operational response capability. H ...
. She took part in Exercise Dynamic Guard, and Exercise BALTOPS 16. In June 2017, ''Iron Duke'' was assigned to maritime security operations and training around the United Kingdom but deployed at short notice to represent the Royal Navy in the BALTOPS exercise in the Baltic. Upon completion of the exercise she took part in
Kiel Week The Kiel Week () or Kiel Regatta is an annual sailing event in Kiel, the capital of Schleswig-Holstein, Germany. It is considered to be one of the largest sailing events globally, and also the largest summer festivals in Northern Europe, ...
2017. ''Iron Duke'' was exhibited at the National Armed Forces day in Liverpool which ran from 24–25 June 2017 where the prime minister
Theresa May Theresa Mary May, Baroness May of Maidenhead (; ; born 1 October 1956), is a British politician who served as Prime Minister of the United Kingdom and Leader of the Conservative Party from 2016 to 2019. She previously served as Home Secretar ...
visited the ship. ''Iron Duke'' was also open to the public. On 28 June, in company with , ''Iron Duke'' provided escort for the aircraft carrier during her first days of
sea trials A sea trial or trial trip is the testing phase of a watercraft (including boats, ships, and submarines). It is also referred to as a " shakedown cruise" by many naval personnel. It is usually the last phase of construction and takes place on o ...
. It was reported in 2018 that ''Iron Duke'' was laid up alongside in Portsmouth as a training ship since mid-2017, owing to a lack of manpower to fully crew the ship. In January 2019, the ship was towed out of Portsmouth for a major refit at Devonport,
Plymouth Plymouth ( ) is a port city status in the United Kingdom, city and unitary authority in Devon, South West England. It is located on Devon's south coast between the rivers River Plym, Plym and River Tamar, Tamar, about southwest of Exeter and ...
. This 'LIFEX' refit would add Sea Ceptor, Artisan radar and new diesel generator sets. The ship's nearly five-year refit involved nearly 1.7 million hours of labour and was completed in 2023. She returned to sea for post-refit sea trials in May 2023. In November 2024, HMS ''Iron Duke'', along with tanker RFA ''Tideforce'', monitored a trio of Russian vessels: the ''Admiral Gorshkov''-class frigate ''Admiral Golovko'', oceanographic research vessel ''Yantar'' and ''Kaliningradneft''-class tanker ''Vyazma'' as they passed through the North Sea and English Channel en route to the Atlantic. All three had been tracked by the
Royal Norwegian Navy The Royal Norwegian Navy () is the branch of the Norwegian Armed Forces responsible for navy, naval operations of Norway, including those of the Norwegian Coast Guard. , the Royal Norwegian Navy consists of approximately 3,700 personnel (9,450 i ...
before the Royal Navy took over. HMS ''Iron Duke'' and RFA ''Tideforce'' both followed the trio through the Dover Strait and Channel before handing over monitoring duties to the
French Navy The French Navy (, , ), informally (, ), is the Navy, maritime arm of the French Armed Forces and one of the four military service branches of History of France, France. It is among the largest and most powerful List of navies, naval forces i ...
. The ''Yantar'', however, continued to remain in the UK’s area of interest, heading north into the Irish Sea, with minehunter HMS ''Cattistock'' monitoring the survey vessel. As the ''Golovko'' and ''Vyazma'' continued their journey past France, ''Iron Duke'' took over shadowing duties of a second Russian group: frigate ''Neustrashimy'' and the replenishment oiler ''Akademik Pashin'', which were making for their home port in the Baltic. The British ships remained in contact with the pair back through the Channel and into the North Sea before handing over to Dutch warship, HNLMS ''De Ruyter'' to finish escorting them back into the Baltic. Throughout the week-long operation, ''Iron Duke'' made use of both her own
Wildcat The wildcat is a species complex comprising two small wild cat species: the European wildcat (''Felis silvestris'') and the African wildcat (''F. lybica''). The European wildcat inhabits forests in Europe, Anatolia and the Caucasus, while th ...
helicopter from
815 Naval Air Squadron 815 Naval Air Squadron is a Royal Navy Fleet Air Arm squadron flying the AgustaWestland Wildcat HMA.2 helicopter and is the Navy's front line Wildcat Naval Air Squadron. The squadron is based at RNAS Yeovilton (HMS Heron) in Somerset. The squa ...
, plus a
Merlin The Multi-Element Radio Linked Interferometer Network (MERLIN) is an interferometer array of radio telescopes spread across England. The array is run from Jodrell Bank Observatory in Cheshire by the University of Manchester on behalf of UK Re ...
of
814 Naval Air Squadron 814 Naval Air Squadron or 814 NAS, nicknamed the Flying Tigers, is a squadron of the Royal Navy Fleet Air Arm. It is currently equipped with the AgustaWestland Merlin HM2 anti-submarine warfare helicopter and is based at Royal Naval Air Stat ...
based at Culdrose, an RAF
P8 Poseidon The Boeing P-8 Poseidon is an American maritime patrol aircraft, maritime patrol and reconnaissance aircraft developed and produced by Boeing Defense, Space & Security. It was developed for the United States Navy as a derivative of the civilian ...
maritime patrol aircraft and aerial assets of other allies to ensure the Russian vessels were closely monitored throughout. HMS Iron Duke conducted a similar operation tracking Russian vessels in the Channel in February 2025.


Notable billeting

Prince William William, Prince of Wales (William Arthur Philip Louis; born 21 June 1982), is the heir apparent to the British throne. He is the elder son of King Charles III and Diana, Princess of Wales. William was born during the reign of his p ...
served in ''Iron Duke'' in the
Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
for 5 weeks from late June 2008 with the rank of sub-lieutenant.


Affiliations

* His Grace, The Duke of Wellington * The Yorkshire Regiment (14th/15th, 19th and 33rd/76th Foot) *
No. 31 Squadron RAF Number 31 Squadron, known as ''the Goldstars'', is a squadron of the Royal Air Force. The Squadron lays claim to being the first military unit to fly in India, where it was based from 1915 to 1947. Throughout the Cold War, No. 31 Squadron was ...
*Yorkshire Universities Royal Naval Unit (YURNU) serving the universities of Hull, Leeds and Sheffield. *
Jersey Jersey ( ; ), officially the Bailiwick of Jersey, is an autonomous and self-governing island territory of the British Islands. Although as a British Crown Dependency it is not a sovereign state, it has its own distinguishing civil and gov ...
*
City of Kingston upon Hull Kingston upon Hull, usually shortened to Hull, is a historic maritime city and unitary authorities of England, unitary authority area in the East Riding of Yorkshire, England. It lies upon the River Hull at its confluence with the Humber Est ...
*
Worshipful Company of Founders The Worshipful Company of Founders is one of the Livery Company, Livery Companies of the City of London, England. The Founders, or workers in brass and bronze, were incorporated under a Royal Charter in 1614. The Company is Trustee of charities ...
*The
Training ship A training ship is a ship used to train students as sailors. The term is mostly used to describe ships employed by navies to train future officers. Essentially there are two types: those used for training at sea and old hulks used to house class ...
''Iron Duke'' *
Wellington College Wellington College may refer to: New Zealand * Wellington College, Wellington, New Zealand * Wellington College of Education, now the Faculty of Education of Victoria University of Wellington, New Zealand * Wellington Girls' College, Wellington, N ...
* Victoria College
CCF CCF can refer to: Computing * Confidential Consortium Framework, a free and open-source blockchain infrastructure framework developed by Microsoft * Customer Care Framework, a Microsoft product Finance * Credit conversion factor converts the ...
, Jersey


References


External links

* {{DEFAULTSORT:Iron Duke Frigates of the United Kingdom Ships built on the River Clyde 1991 ships Type 23 frigates of the Royal Navy