Royal Navy Sloops, Corvettes, and Patrol Vessels
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Sloops
Black Swan Class LOA 299′ / 91.1 m TDISP 1,300 tons (37 built over to types, 1 remaining in Egypt)
ex-HMS Whimbrel U-29 (1943) transferred to Egypt as El Malek Farouq in 1949, renamed Tariq 1954, Egyptian Navy is currently investigating a sale back to Britain (Liverpool) for preservation as a museum ship.
Grimsby Class LOA 266′ / 81.1 m TDISP 1,400 tons (13 built, 1 preserved)
HMS Wellington U-65 (1934 – 1947) and became HQ ship
Anchusa Class LOA 262′ / 79.9 m TDISP 1,300 tons (28 retired, 1 preserved)
HMS President ex-HMS Saxifrage “Q-ship” (1918) Anti-submarine vessel disguised to look like a merchant ship. Now HQMS President, stationary ship 1922-2016 Victoria Embankment, Thames, reserve drill ship and gunnery training ship, then sold to civilian interests as a conference center. Was moved for construction of a new tunnel. Currently is in Chatham Dockyard, with plans to return her to the Thames.
Offshore Patrol Vessels
River Class Patrol Vessel LOA 260′ / 79.2 m (Batch 1) to 296′ / 90.2 m (Batch 2) TDISP ca. 2,000 tons (11 active)
Castle Class OPV LOA 246′ / 75 m TDISP 1,420 tons (1981-2010) transferred to Bangladesh 2010. 
Patrol Boats
Fairmile Type B motor launch LOA 112′ / 34.1 m TDISP 85 tons Second World War local patrol boats used in a variety of roles. These were often repurposed as ferries, houseboats, excursion vessels, and occasionally private yachts.
RML-497 after decommissioning, served as a ferry Western Lady III, in the Brixham/Torquay area.
ML-357
RML-546
Fairmile Type C motor gunboat LOA 110′ / 33.5 m TDISP 72 tons
Harbour Defence Motor Launch / Seaward Defence Motor Launch LOA 72′ / 21.9 m TDISP 54 tons (ca. 370 built, very few remain) wooden hulled, often of mahogany. Intended for Anti-Submarine defence of the approaches to harbours, but used more widely.
HDML ML-1387 (1943-1968) later HMS Medusa. Museum ship with HMS Medusa Trust, operating out of Gosport. Postwar she served as a surveying ship, and then was sold privately, until refurbished and preserved in 2003. Her long and colourful history is explored at the website of the Trust.
The Searchers 