there is not much you can do, if its dark in plymouth your best bet is to go home asap really, My friend adam had his camra nicked in front of use, so we said WTF give it back! they were massive lol and then tryed to start on us, and they walked away with a 200-400 camra. also the other day(it was dark) just walking up in the city center a chav smacks my friend in the back of the head broke his helmet and tryed to grab his bike of him luckly they were pissed so they got board.....