Thanks for that link, I knew Dave Osborne on the MU, he was engines and I was a rigger, but I didn't work on that repair, but remember the event.
I applied to join the rescue team, there were several fitters on the MU who had completed the parachute course, ( mainly to relieve the boredom of sitting around the MU waiting for a crash to repair), I did the last parachute training course in November 1974, on completion the whole thing was folded, and the team was disbanded.
This is the last course carried out, I had rather more hair then.