One of my sisters old boyfriends ran the tale that he had been in the RAF as a pilot and even gave me some JP5 pilots notes with 'F/O ******' (his name) written on them.
I suspected he was telling porkies and some time later his Mum confirmed during general conversation at a party that he had been an airframe fitter!
I know of a guy who was commissioned from the ranks and started pilot training, only to fail. Looking at the other branch options available, decided he would rather go back to his old job and resigned his commission. This would have been in the early to late 80s.