bad co have been the best Thai gym in the uK for years. they are now probably the best Thai gym in the world outside of thailand. they are simply leagues ahead of everyone else and seem to just get stronger every few months.
Wicker camp and Keddles are probably second and third. Wicker camp are a very strong gym too and keddles produces very, very good women!
of course there are up and coming gyms too like salford but they are not in the same league as bad co yet.
i think kiatphontip uk is gonna be a very good gym once it has got going a little more.