I\’m not wholly convinced by these figures:
The Home Office estimates that there are between 6,000 and 18,000 trafficked women and girls being forced to work as prostitutes in the UK.
The number of "traffficked" women I have no problem believing. The number working as prostitutes I hae similarly no problem believing. It\’s the forced part that I\’m not sure about.
As Gary Becker pointed out decades ago those who work as prostitutes face a huge cost in terms of their own social capital losses when they do so. It\’s therefore entirely unsurprising that some (many?) do the work outside their home community. Given the greater mobility of the population in general these days as opposed to even a few decades ago it would gain not be surprising that people moved country rather than just city to do so now.
So the question is what is the confabulation of these two things? Those forced into prostitution and those who have voluntarily moved? Those voluntarily moving might well have been "trafficked" in the sense of a network existing that aids them in finding an appropriate brothel or massage parlour.
As I say, I don\’t really trust those figures for they seem to be adding two rather different things together to get a nice high total.