OP has posted he's interested in a massage shop in London which has black staff and gives massages with extras. Not a brothel, not an independent (as mentioned, a whole thread on them).
To MY knowledge, other than Carla at Athree there are no black women working in massage shops (not brothels) in London. The one on New Oxford Street (now closed) did have a reported Brazilian, ditto the Cricklewood place which is still going and also Skylines in Lewisham.
This is in all probability due to the fact that to stay within the bounds of the law such a shop has to offer Traditional Chinese Medicine and associated treatments or operate (in the case of Athree) as an Indian spa.
I am sure an Afro-Caribbean massage shop could clean up (so to speak) but it'd be interesting to see how they could market their treatments...
(misread the post/title, FFS)