There are several big groups of managed Thai girls. I have chatted to a couple of them about it.
It’s not trafficking… the girls know they are coming to uk to do this work however they are heavily managed. Their inbound flight, where they go each week, the flats, all coms handling, their aw page etc. I think most of them come for 6 months to make enough to go home and do something else, or to learn enough to return to uk and manage themselves.