Note that this article does not deny the existence of sex trafficking, it does question how common it is.

The UK’s biggest ever investigation of sex trafficking failed to find a single person who had forced anybody into prostitution in spite of hundreds of raids on sex workers in a six-month campaign by government departments, specialist agencies and every police force in the country.

The failure has been disclosed by a Guardian investigation which also suggests that the scale of and nature of sex trafficking into the UK has been exaggerated by politicians and media.

Current and former ministers have claimed that thousands of women have been imported into the UK and forced to work as sex slaves, but most of these statements were either based on distortions of quoted sources or fabrications without any source at all. […]

There were just five men who were convicted of importing women and forcing them to work as prostitutes. These genuinely were traffickers, but none of them was detected by Pentameter, although its investigations are still continuing.

Two of them — Zhen Xu and Fei Zhang — had been in custody since March 2007, a clear seven months before Pentameter started work in October 2007.

The other three, Ali Arslan, Edward Facuna and Roman Pacan, were arrested and charged as a result of an operation which began when a female victim went to police in April 2006, well over a year before Pentameter Two began, although the arrests were made while Pentameter was running.

Guardian: Inquiry fails to find single trafficker who forced anybody into prostitution

Via Dr. Petra, who has commentary here.