I don't mind getting thrown around like a ragdoll as long as they're nice about it.
Looks like South London has some of the best, I imagine I'll end up at Tokei though just because it's more central. From what I can gather Judo clubs, like BJJ, have pretty good consistency so I should be fine. Most seem to have BJJ too which is good as I won't have to go back and forth across different clubs.
Thanks for the info guys.