London Bike Shops - A Map

A couple more:

Foffa bikes,

Don't know if they are any good, never used them:

http://foffabikes.com/

My mate got a stolen peugot of this guy (he did not realise at the time) but might be OK for other stuff, good for bartering.

http://www.towercycles.co.uk/

Ha, Read this thread:

http://www.lfgss.com/thread35474.html

Maybe I should be more descriptive, foffa used to have one of the worst mechanics in London, they've got rid of him... But they are still far from recommended by this forum.