Bronson is pretty good. Very inaccurate though. Barry the Baptist ( Lenny Mclean) in Lock Stock was a Real, Legendary "Hard Man," and bounced clubs for the Krays. I'm sure Guy Ritchie got plenty of stories from him. He was also an unlicensed boxer, as was Charlie Bronson. All those guys have books out now. Some of the fights are on youtube. They are gritty and brutal. Check out Roy Shaw too.