Thanks MX250 its always nice to watch that film. I think it was the 1974 or 1975 Scott Trial, which is an event that always reveals how badly some people can ride when they are totally stuffed.
This year a top-level pommy enduro rider rode the Scott on an enduro bike against the trials bikes and finished somewhere not too far from the pointy end which is an incredible achievement when the terrain and time schedule is considered. There is some video on Youtube somewhere of him riding one of the gnarliest sections which is quite eye popping. I'll have a look for it later on