HMS Halsham (M2633)

HMS Halsham was one of 93 ships of the Ham-class minesweeper of inshore minesweepers of the Royal Navy. Their names were all chosen from villages ending in -ham. The minesweeper was named after Halsham in the East Riding of Yorkshire.

She was transferred from the Royal Navy to Royal Air Force duties in 1966, renamed No.5002 (later No.5012) and converted to a research and trials vessel for Royal Aircraft Establishment, Farnborough. By 1972, she was the only remaining RAF-operated marine asset, and to provide continued efficient management she was transferred to the Royal Corps of Transport's civilian fleet and renamed Richard George Masters (later chortened to R G Masters). Private Masters was the sole recipient of the Victoria Cross in the Royal Army Service Corps during the First World War.

In 1979 she was withdrawn from military service, and then sold to Pounds Shipowners & Shipbreakers at Portsmouth, who resold her in 1981 to Greek shipowners Petrakis Line of Corfu. She was renamed Sotirakis and converted to a tourist excursion boat.