Brothels in Croydon?

I was in a pub recently and I heard two guys talking about how they can get cheap uninhibited sex with women from Eastern Europe in Croydon. They talked about going to someone's home before or just after work. They kept emphasising how young the girls were and how great it was they could go to a home and not be seen. I must admit I was shocked when I heard these guys talking so brazenly about this. Maybe the alcohol was loosening their tongues. In recent news reports I have heard of girls being brought into the country under false pretences and ending up as prostitutes. Is this what these guys were talking about and could this be happening in Croydon? Anyone else out there have any suspicions or noticed comings and going from private homes that don't look right? If it is happening what should we do about it?