Well, I know England has been cracking down on human trafficking lately and I'm thinking that might be what we're talking about. You might know something I don't considering you live there and all, though. Contrary to popular belief, prostitution is not legal in Thailand. The police just aren't encouraged to enforce that particular law--unless it's in their favor to do so, I imagine. Also, the age of consent in Thailand is 15. Is there a case where someone had consensual sex with someone between the ages 15 and 18 in Thailand and was arrested for it in England? Otherwise the person would have been breaking Thai law and your point would be moot.