This is all rather odd.
Although this girl claims to be British, her profile gives off the vibe of a peripatetic Romanian or Brazilian. (The words "In town" in the headline, and so on.)
However £80 for a half-hour out-call is a bargain-basement price that you wouldn't normally see on Vivastreet, or Adult Work, or anywhere else.
Also where did Avatar find the face pic (now deleted from his initial post)? It doesn't appear on the girl's Vivastreet profile.