I'd say if you are into Asians. Have a look at some of the Water Street girls. Seen Meena (
External Link/Members Only) recently again and didn't leave disappointed. Some new British girls popping up are getting close to providing a Rom-style service now and don't give a crap about your time (
External Link/Members Only <<< this one as an example. I'll post my review of her in a few weeks. Otherwise, it's a resounding negative).
External Link/Members Only - Summer's rates are silly now. As pleasant as my experience was with her, she is not a £350 per hour girl.
External Link/Members Only - I have seen Maddison recently and can say she is a good provider, though you have to take the lead a bit with her. Once you get the ball rolling, it's all fun from that point. (Will post my review in time about her).
Otherwise, it is slim picking in the City at the moment.