It's a fairly clear route, or it has been in the last 10+ years. Get chatting to the dancers, buy some dances, and ask if there are any more private functions they dance at. Many girls do, and you might get invited to a more private do. Maybe a flat party, or maybe in a basement of another pub, that isn't advertised... Once you get into one of these places, the scene opens up, as there are a few different options, and many crossover from event to event. Not all girls do, ymmv, but that's how to break the false barrier of believing that strippers don't suck dick for £60!