There is a report on the loss of the Gaul available on a web-site that I shall try to locate the address off - I found it via Yahoo by simply inputing ' loss of the gaul' in the search engine.
One of the things the report states is that at the end of the Seventies, after the initial fuss of her loss had died away and she was no longer hot news, the Ministry of Defence had actually located her, pretty much.
However, in the way of such things, folks had moved on, up and out, so that when the story resurfaced, so to speak, the people who HAD known where she was were no longer in that department, and the new folks had no idea where she was- whilst the older folks were constrained by the Official Secrets Act. So they had to go through all the rigmarole of a new search.
Goes to show that, sometimes, one should never posit a conspiracy when the more likely explanation is that the people who did know are simply no longer in a position to tell you.
Mind you - that's not always the case... sometimes they are out to get us.
The lightbulbs told me so...