If you do a AW search on the full location string given (
Harrow, Wembley, Watford, Sudbury, , Kenton) including the poor editing, you'll find 4 profiles: 3 cheap Hungarians all at £60/hr (a couple of them offering BB to boot) and the one you're asking about. You can work it out for yourself.
FWIW no way is an american girl going to price herself so low, unless something is very wrong (e.g. addict)