Shops

yeah, there is a dude in the Camden Cycle Surgery, must be late 30's or something, rides BMX predominantly I believe...he is really helpful and, to the extent that I can judge, knowledgeable too...

Krisz perhaps?

Amazing mechanic, love watching him work. Really knows his stuff.
He used to race bmx and now spends most of his time at Herne hill.

He also does a lot of work outside of scurgery...
http://kriszscyclelab.com/