ASK21 at RAF Bicester, RAFGSA centre on a Joint Services Gliding Course. It was an aero tow behind a Pawnee
When was that Smuj? I was there on a week's jolly in '91 and I can't remember the name of the CFI now. It was a Sgt somebody. I remember floating around in a bit of wave watching the C5's going into Upper Heyford looking for all the world like a block of flats with wings.
By the way if you there around that time there's a good chance that one Cpl Pete Stratton was your tug pilot. Pete is now CEOof the BGA!