In reply to kolkrabe:
The arch is excellent, wide range of stuff with different characters to lots of the problems, slabs and overhangs galore, used to get crazy busy, may have improved with the second wall nearby.
Vauxwall is good, although there seemed to be more crimps than anything else when I went there (about 2 years ago so setting may have changed).
Mile End was my favourite, good range of holds, a variety of angles, decent setting and a good crowd, never got too busy from what I remember, also, the money room is brilliant!