Done this a few times in the past. Not only do they hang round the bars in Shoreditch but the strip clubs in Holborn, Parkers etc. The guys who approached you get a kick back, 10% I think on the money you drop in the house, beware the house is a honey trap. They get you in there £200 an hour is what I was charged, then they will try to entice you with another girl as well, then out comes the coke and beer, then it gets really messy. Just to really fuck you up they take credit cards.
To be fair it's a great time, but fuck it can get away from you. If your loaded, bingo impromptu sex party, no arranging, no probs if your not then be very careful.
When you get to know the guys they actually do look after you but why shouldn't they, your worth a lot! Free ciggies , Viagra, coke, taxi ride pretty much anywhere.
But you will pay for it in the end!