HMS Mermaid (U30)

HMS Black Swan, was the name ship of the Black Swan-class sloops of the Royal Navy. This class was admired for its sea-going qualities.

HMS Grenville was the second ship of this name to serve with the Royal Navy in the Second World War. Grenville and seven other U-class destroyers were ordered as part of the Emergency Programme. She was launched at Swan Hunter and Wigham Richardson Ltd., Wallsend-on-Tyne on 12 October 1942 and commissioned on 27 May 1943.

HMS Orwell was an O-class destroyer of the Royal Navy that entered service in 1942 and was broken up in 1965.

HMS Undine was a U-class destroyer of the British Royal Navy that saw service during World War II. On 27 March 1945, HMS Undine detached from RN Fast Carrier TF57 to rescue the airmen of a downed RN TBF Avenger aircraft also rescued a USN Corsair pilot adrift for two days south of the Sakishima Gunto in the Philippine Sea.

HMS Ursa was a U-class destroyer of the Royal Navy that saw service during the Second World War. She was later converted into a Type 15 fast anti-submarine frigate, with the new pennant number F200.

HMS Termagant was a T-class destroyer of the Royal Navy that saw service during the Second World War. She was built by William Denny and Brothers, of Dumbarton and launched on 22 March 1943. She was scrapped in 1965.

HMS Magpie, pennant number U82, was a Royal Navy Modified Black Swan-class sloop launched in 1943 and broken up in 1959. She was the seventh Royal Navy ship to bear the name. She was reclassified as a frigate in 1947, receiving a new pennant number F82. The ship was the only vessel commanded by Prince Philip, Duke of Edinburgh, who took command on 2 September 1950, when he was 29.

HMS Atherstone was a Hunt-class destroyer of the Royal Navy. She was launched in late 1939 as the first of her class but was found to be unstable, and had to undergo significant modifications before entering service in March 1940.

HMS Zephyr was a Z-class destroyer. She was launched on 13 July 1942 at Vickers-Armstrongs' High Walker shipyard and commissioned on 6 September 1944. She was 'adopted' by the civil community of Doncaster, replacing the destroyer HMS Lightning, which had originally been adopted during Warship Week in 1942.

HMS Douglas was an Admiralty type flotilla leader of the British Royal Navy. Built by Cammell Laird, Douglas commissioned in 1918, just before the end of the First World War. During the Second World War, Douglas served with Force H out of Gibraltar and as a convoy escort. She was sold for scrap in March 1945.

HMS Oakley was a Type II Hunt-class destroyer of the Royal Navy. She was originally to have been named Tickham, however she was renamed after her sister ship Oakley was transferred to Poland and was renamed ORP Kujawiak (L72). She entered service in May 1943, carrying out convoy escort, patrol and anti-shipping attacks for most of the rest of the Second World War. She was adopted by the Civil community of Leighton Buzzard in Bedfordshire as part of Warship Week in 1942. In 1957, she was sold to the West German Navy, serving as a training ship for the German Naval Gunnery school until scrapped in 1972.

HMS Flamingo was a Black Swan-class sloop of the Royal Navy. She saw service as a convoy escort during the Second World War, seeing extensive service in the Mediterranean and Far East in 1945.

HMS Hart was a modified Black Swan-class sloop of the Royal Navy. She saw service as a convoy escort during the Second World War, seeing service in the Atlantic, Mediterranean and Far East in 1945. She also took part in the Korean War in 1950 and 1951.

HMS Alacrity was a modified Black Swan-class sloop of the Royal Navy. She was built for service as a convoy escort during the Second World War, but was completed too late to see action. She did subsequently take part in the Korean War between 1950 and 1952. She was scrapped in 1956.

HMS Peacock was a modified Black Swan-class sloop of the Royal Navy. She was built for service as a convoy escort during the Second World War, serving in the arctic and Atlantic convoys. After the Second World War she saw service in the Mediterranean. She was scrapped in 1958.

HMS Fleetwood was a Grimsby-class sloop of the Royal Navy. Built at Devonport Dockyard in the 1930s, Fleetwood was launched in March 1936 and commissioned in November that year. She served in the Red Sea until the outbreak of the Second World War. Fleetwood served as a convoy escort during the war, which she survived, and sank the German submarines U-528 and U-340. Post-war, the ship served as a radar training ship, remaining in use until 1959, when she was scrapped.

HMS Modeste was a modified Black Swan-class sloop of the British Royal Navy. She was built by Chatham Dockyard, during the Second World War, being launched on 29 January 1944 and commissioned on 3 September 1945. Post war, Modeste served with the British Far East Fleet, and took part in the Suez Crisis. She was paid off into reserve for the last time in 1958 and scrapped in 1961.

HMS Crane was a modified Black Swan-class sloop of the Royal Navy. She was laid down by William Denny and Brothers, Dumbarton on 13 June 1941, launched on 9 November 1942 and commissioned on 10 May 1943, with the pennant number U23. She saw active service during the Second World War, initially performing convoy escort roles in the Atlantic before supporting the Normandy landings. In the final months of the war, Crane joined the British Pacific Fleet and saw service during the Battle of Okinawa. Post-war, Crane remained in south-east Asia and took part in hostilities during the Korean War. She was redeployed to the Middle East during the Suez Crisis before returning to Asia for service during the Malayan Emergency. Crane was withdrawn from service in the early 1960's and was scrapped in 1965.