To find the place go into the pharmacy, walk towards the end of the shop and on the right there's stairs down.
I couldn't fault this place. The staff member I met (Alex) could not be lovelier and it was the most pain free wax I've ever had (I've been to quite a few places). It was also by far the quickest.
They've very professional - things like reminding you about after care which not everyone always does.
Fantastic! Couldn't have asked for a more efficient process, lovely staff member, and watching Friends on TV! Would highly recommend and if I'm ever back in London they will be my go to!