Hunting for my Bike in Brick Lane

Stab Vest
Running shoes.

Seriously, depending on who you find sellling it (IF you find it), assess the situation carefully as the 'vendors' are very aware and protective of their trade. Be very careful. The law is your best bet if you find it. Go find a copper, then go back. Apparently there are usually a few lurking here and there.

Think this might be better.