I love this film, the director is amazing.
I remember skinheads in the 80s' and I guess the 'trend' can be seen today, even though 'skinhead' was part of the working class culture. But with the working class/under class (like most cultures) - 'cultures' change. The way I see it is... Mods have become skinheads and skinheads have become 'chavs'. Not all skinheads are 'racist', skinheads was a working class culture (that were into reggae and ska) that rejected the 'mod' culture as Italian suits, scooters, etc were expensive, etc. Therefore with the rise of under mass employment under Thatcher they could not identify with such consumerism e.g. 'expensive suits'.
Some became 'racist' (not all!) because they blamed immigrants for the rise of mass employment, the Falklands and the closing of coal mines - this created anger amongst the w/class. Today, we have 'chav' - gold chains, check shirts, gel down hair, caps...still quite similar. This is because working class has developed into an 'under class', the 'won't work, can't work' generation.