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It was RFA Sir Galahad and it was lost along with its sister ship RFA Sir Tristram at Fitzroy Cove, Falklands

Both Sir Galahad and Sir Tristram are namesakes of the ones that were lost.

Honours, Falklands, RFA Sir Galahad Capt P J G Roberts RFA, co RFA Sir Galahad - Distinguished Service Order Second Eng Offr P A Henry RFA, RFA Sir Galahad - George Medal - Posthumous Chief Eng Offr C K A Adams RFA, RFA Sir Galahad - Queen's Gallantry Medal Note that RFAs are not White Ensign ships. Sir Galahad is flying the Blue Ensign.

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Sorry for the bad formatting: Honours, Falklands, RFA Sir Galahad
Capt P J G Roberts RFA, co RFA Sir Galahad - Distinguished Service Order
Second Eng Offr P A Henry RFA, RFA Sir Galahad - George Medal - Posthumous
Chief Eng Offr C K A Adams RFA, RFA Sir Galahad - Queen's Gallantry Medal

Note that RFAs are not White Ensign ships. Sir Galahad is flying the Blue Ensign.