I was there!
I would just like to say that I was at the outdoor concert that is included in the film! It was a Rock Against Racism gig in Victoria Park in London (England) in the summer of 1978 (I think!). We (some mates and I) went down on a coach from Norfolk. Also appearing were Steel Pulse (a reggae band) and the Tom Robinson Band (Tom was openly gay), as well as some politicians givin speeches. I also saw the Clash at the de Montfort Hall in Leicester two or three years later.
Happy days..........
Alan F
August 2004