Their names were all chosen from villages ending in -ham. The minesweeper was named after Powderham in Devon.
In 1960 she was selected to be converted to an inshore survey vessel and was renamed HMS Waterwitch. For a while she was manned by civilian Port Auxiliary Service personnel and was named PAS Waterwitch.
In Dec 1998 she was operated by a voluntary, non profit making group of ex Royal Navy and Merchant Navy personnel, who with the co-operation of participating local authorities and other interested organisations offered a shipboard training facility for disadvantaged young people.