They served for a number of years supporting Royal Navy and allied fleet operations, during which one, Ennerdale, was lost.

[1] The wreck was subsequently destroyed with explosives fired from Wessex helicopters to prevent an oil spillage from threatening the Seychelles.

[2] During this time Dewdale saw service with the Aden task force during the British withdrawal in 1967, and was then active then on the Beira Patrols.

[2] In July 1967, the MOD announced that it had bareboat chartered, for a period of seven years, three large tankers for the Royal Fleet Auxiliary.

[6] Ennerdale was launched on 31 August 1963 as Naess Scotsman for the Anglo-Norness Shipping Co Ltd[5] and began her charter in July 1967.