Bradford University's Technical Services Association (TSA) had a sub group known as NWA (Night Walkers Association) that ventured far and wide - usually after the saturday night dances.
We spent a few days camping up in Scotland in 1973 (I believe) and visited Skye and Lindisfarne on the way home.
Recently digitized this is targeted especially at those in the film, or those knowing the people in the film. One name that has just come to mind is Rob Gray who appears to be poking out his eye - but in reality was sticking a contact lens in it. The members of the group identified so far (by John Kettle)are:
Good times, all those years ago; now just fond memories.
Pass along the link, or the video if you know anyone in the film