If you're from the States, then the gang violence here is nothing compared to the likes of the Brotherhood, Crips/Bloods, Mexican Cartels etc etc...
However, some areas can get pretty tasty at night so here's the ones you need to avoid if you hope to still have your wallet and phone at the end of a hard day at uni...
1. South London: CROYDON/BRIXTON/ROTHERHITHE
2. West London: HAYES END/WHITE CITY/WEMBLEY
3. East London: HACKNEY/ILFORD/MILE END/ BOW
4. North London: TOTTENHAM/EDMONTON/BARNET