I went into a place called Thai Massage (and something) on Frith Street in Soho near Shaftesbury Avenue.
Had a massage from Annie (?), 30+ tall (around 5,7"), slim and pretty thai lady. This was a Tuesday, I don't know what other days she works. Massage was very good, Ł50 for one hour. The place is very well decorated compared to other massage parlours so you could even bring your wife here lol.
Extra started from 60 for hj, paid 30 at the end, she said that she can't take her cloth off because it's a policy there (regardless of how much you pay). Her English was very good and she had a nice, elegant posture. the whole thing was a very nice experience and would go back, but she told me she charges a lot more usually, so I felt like I wouldn't be welcome back with my 30 quid.
I also saw there three other girls, 2 of them were pretty, one of them had a big rack, all thai of course.