I met Mistress Alexandra Wildfire -
External Link/Members Only - in September.
She has a very well appointed flat just a few minutes walk from Brixton Tube station.
She is a very attractive Polish dominatrix in her mid 30s. Blonde, tall and very dominant.
Upon arrival, I paid my fee of £250 for an hours session - having previously paid a £50 deposit through Amazon.
I was ordered to undress completely and was then tied to a rack where I was variously whipped, spanked and had pegs attached to my bollocks. Not for everyone, but I really enjoyed it

Later, I was put into a humbler and made to expose my arse while she pegged me and then milked me while I was helpless.
Really good session with a well known dominatrix. Expensive but within the ball park of other dommes that I can see online and she was certainly an expert at what she did.
Not in London a lot, but would happily go back to serve her again.