Which prang were you looking for? I was in a really good one in 1989 and that was one of the few where the AAIB did the investigation and prepared a report.
I've just bought an old K8 glider to do up and going through the logbook I discovered it had survived a mid-air collision which severed the port wing from mid aileron out
I was just curious for more details. I think the glider would have been based at Lasham at the time.
SS