During my current research I have also found the Anti-Slavery International website to be a useful resource, particularly:

The Slavery On The High Street Report that has just been published [1 June 2012]

and the Slavery on the High street summary [Jun 2012]

and it is shocking to see how many of our high street shops and supermarkets are culpable as can be readily seen in this table and footnotes.

Anti-Slavery International also provide a valuable online resource library of numerous reports including a number specifically relating to trafficking.

They have also produced a map showing the products of slavery which I found to be rather disturbing.