I think that would have been at the end of 77 as I had taken my girlfriend to visit Leuchars Ops that summer. (Romantic or what?) During the visit we had a live qra scramble, so she got to choose the callsigns for the aircraft being launched.
At new year when the tv show was on, showing the ops guy selecting callsigns and telling the crews to go, she was telling her family that she'd been there and done that.