I hope this doesn't contravene prune's rules but here's the best I can think of: a former Squadron-mate, who left the FAA in about 1989, I guess, was one Lieutenant R I S D Smith ('Bob'), erstwhile Wessex and SeaKing driver. He spent some time at Deadloss as a hovercraft pilot on the Trials Unit.
When last I heard, a very long time ago (!), he was working for Pilkington's Glass in North Wales, around Bethesda, I think.
I know it's a very long shot but if you're really desperate ..............
Good luck.