How about the RAFLO who was posted to one of HM Ships? Pre Falklands War HMS Endurance was established for a Spanish linguist. The Andrew had none to call on in 78, so a light blue Nav did the trip in 78/9. I don't think he did the full two year tour, so he probably went back to light blue land in the early/mid summer of 79.
Not a rumour, as I was also on board for part of the deployment.