Well, Brick Lane is the obvious one, but there has also allegedly been stolen bike activity at the top of Broadway Market (junction with London Fields, Lansdowne Drive, and Westgate Street). I can't confirm that, but there have been a lot of rumours. Stolen bikes are also said to have been sighted at the Kingsland Waste Market. I haven't heard of other local markets, but of course it's just as likely to end up on Gumtree. Good luck.
Well, Brick Lane is the obvious one, but there has also allegedly been stolen bike activity at the top of Broadway Market (junction with London Fields, Lansdowne Drive, and Westgate Street). I can't confirm that, but there have been a lot of rumours. Stolen bikes are also said to have been sighted at the Kingsland Waste Market. I haven't heard of other local markets, but of course it's just as likely to end up on Gumtree. Good luck.