Heads up

+1, not a good idea

best thing is to ring the police, they know it happens, the more reported incidents there are the more likely it is they can do something about it

+1

These kids might be off the Marquis estate - if they are, then they are probably responsible for 90% of the bike theft in the Upper St/Essex Road are, and they are seriously nasty. Take one on, and you'll more than likely have 10 or more after you. Unless you are Bruce Lee that means you are looking a long stay in the hospital.