"No one shall be required to perform forced or compulsory labour."
Human Rights Act (1998), section 1(3), article 4

A-HA! Is this why the Conservatives want to get rid of the Human Rights Act?

Firms taking advantage of the Conservative and Post-Liberal Slave Labour scheme include -
Tesco, Asda, Argos, Holland & Barrett, Primark
Addendum (20.2.12) How could I have missed those leaders in the field of exploitation - McDonalds, Burger King? And a special mention for Sir Philip Green, chevalier d'industrie; he's the individual who is a pauper for tax purposes and a billionaire for all other purposes. One of his money-makers, Arcadia by name, has its share of Sklavenarbeiter.
"Et in Arcadia ego"
Etiam in servitute, it seems. Arcadia ain't what it used to be.

Firms known to have used slave labour, possibly still doing so -
Morrisons, Savers, Wilkinsons, B&Q, Matalan

Firms who have pulled out of the scheme -
Sainsbury, Waterstones, TK Maxx

Firms not cooperating with "Arbeit macht frei C21"
Waitrose


Update (20.2.12) I have heard that Matalan has suspended its dealings with the state's people traffickers. So what then happens to those already in bondage? Are they returned to the trafficker, or kept in servitude? (Sarcasm alert!) Maybe they become paid workers.

Update (21.2.12) An appallingly long list of offenders can be studied here.