Sorry for ressurrecting an old thread for my first (and probably only) post, but as I was in the audience for this episode, and saw some of the build up, I'm pretty sure the account given in the book is wrong.
I can't remember who was on the team apart from the Times columnist David Aaronovitch (who uses a photo of the team as his Twitter avatar), but they certainly had not 'dropped out' of the university, though it may well be that some or all of them were sabbatical officers at the student union for that year.
My recollection is that the union voted for the members of the team, and that there was a confused mixture of motives for the protest: part anarchist, part Trotskyite 'permanent revolution', and a much larger but mostly ineffective desire to use the programme as a platform to protest against apartheid, which was the hot campus topic at the time. The team might well have been "under the influence" but it certainly planned to do what it did.
The packing of the audience was absolutely right, though. The tickets the Beeb sent were just photocopied for anyone who wanted to come...
You mean GRANADA not the Beeb. It was an ITV show in 1975.