I haven't been in London in too long a time and to be honest I didn't dance back then. The friends I got over there claim to dance but you know, some men will have been doing everything since kindergarden the moment someone mentions having the hobby... but will of course always be too busy to prove their expertice ;)

Still maybe try this website I stumbled across during my websearches a couple of weeks ago:
http://www.eightohone.com/ballroomlondon/index.php
(I dont seem to be able to add the link using the nifty interface sorry)

I'll try and ask around and see if I can find some first hand info.