I'm a regular UKP user posting from a (new) different account - I can't afford for my account to be traced via my pretty unique knowledge of this place I am about to recommend. :angel girl:
Google Chayanan Thai Hair and Massage. It's on King's Cross Road and I think this may be the sort of thing you are after.
It has all the pretences of a 'legit' salon : pretty interior, the staff dressed moderately respectably. What drew me in initially was the sheer hotness of the owner (Chayanan). If you are clever on Facebook you will be able to find pictures of her on her very public profile. She is AMAZING looking. She looks elegant, has a great MILF body, and doesn't have the botched face job look that most Thai girls have. I walked in one day for a half hour massage - there were no attempts at seduction - she didn't even do the whole stroke your balls gently as she massages your upper thigh thing. So I decided not to ask for any extras coz i didn't wanna rock the boat.
Having had a disappointing dream but not able to get C out of my head I decided to book in again. This time she was much more forthcoming. 45 minutes into my 1 hour massage with me turned around, she was doing my upper thigh and her hair was stroking up and down my crotch brushing past the thin towel covering it. I instantly got a boner. I apologised. She took the cue and offered extras. The rest I won't reveal because it may give up my identity but suffice to say she doesn't do sex.
She has an amazing tight body with gorgeous skin tone and tattoos. I seriously recommend you guys try her out.
But this is a diamond in the rough and please treat it that way!