I too have watched Ross Kemp On Gangs and now never leave the house apart from a quick sprint to the newsagents each morning to pick up my copy of the Daily Mail. You can't be too careful.After watching programmes on gang culture recently I think its good advive for a foreigner in a strange country, I would not stray of the beaten track in many countries.
You should see Herr Tubthumper's guide to England.