I am traveling to the UK soon, as was looking for information about reliable agencies (or review boards) in London. Unfortunately, I have not been able to find the Terb equivalent in London!
Ask this question in the International Section (right at the bottom of these forums) and I am sure you will get a good answer...BTW I love the UK Escort sites - lots of good information and clear face shots usually as well.
When I was last in the UK (as a single guy) I just hit the local Pubs and always picked up a willing 'bird' - the accent if part of the draw for them (and my is more Australian than Canadian and I lived there a number of years).