Nana (from Roseberry Spa, a well reviewed shop here on UKP) told me she has opened a second location called
WXY Spa.
External Link/Members OnlyThe address is 111 Bell Street, London, NW1 6TL, it is located between Marylebone and Edgware Road tube station.
(Currently the address is not on their website

whoever developed the website deserve a kick in the bum)
She said to celebrate the grand opening, she is offering a £10 discount for all massages until the end September.
I'm going to check it out when I can find the time.