Have a look at Club XS, I ve been told is fantastic by someone I trust as a conesseur...find out about membership b4 u go coz, even tho I think is free, you cant go unless is with membership.
I m certainly gonna give it a go when I m cleared for driving by my (ohhh so loved) surgeon.

http://www.londonfetishscene.com/newsdesk/ViewArticle.asp?ArticleID=1187

You could try www.kinkykent.co.uk dizzy and Capt seem to know whats about in the area and they organise one of the local munches