Perhaps visit a forum on the internet where regular users of hookers post reveiws, these sites are generally quite easy to navigate and I'm sure once located the reveiw section will be easy to find. I'm sure you'd find a girl or two that way.
Also quite a few of these sort of sites have search function I beleive, maybe type wembley in the search box and again see what you find.
Good luck and please let us all know how you get on??