Alas...perhaps someone else can find one in this area...I could not. But if you hop on the Jubilee LIne to Bond St., you can get some good classes at DanceWorks (5 min walk from station). Website: www.danceworks.co.uk
I used to teach Salsa but no venue at the moment but there is a class on Wednesday night at Wellington's Health Club on Lower Marsh so good luck and enjoy!
I obviously know of other places so any other area you could consider send me an email!