See the article by Billy Kenbar here:

http://www.independent.co.uk/news/uk/home-news/abused-humiliated-and-abandoned-what-really-happens-when-the-uk-deports-failed-asylumseekers-2018387.html

Authorities launch drive to boost conviction rate as China is revealed to be one of the main sources of trafficked people.

See the article by Robert Booth here:

http://www.guardian.co.uk/law/2010/jul/29/human-trafficking-prosecutions-policy