Cheers for all the replies. Brakes back then were all cantelevers, although Maguras were around - but they had crappy flexible resin levels back then and they were break easily in a crash.
The more I read this site, the more I feel I need a new bike...... I would quite like to build my own again, like my Zaskar. I rode trials for 2 to 3 years after that video was taken, so got a bit better. In the video I wsas using SPDs (really!), but I learnt to use platforms in 1994. The bike now has hope titanium hubs, middleburn cranks, GT alloy pedals, control tech stem, club roost bars, USE post, flite saddle, mavic rims, mostly XT, deore V-Brakes, RockShox.... all very old stuff though.
I think I'll learn what I can here before I go building a trials bike.