I was under the impression slavery was illegal anyway - but there's a new law in compliance with the European Human Rights act...
Here it is:
Except right up front it lays out some get-out clauses:
"Those exceptions are work done in the course of lawful detention, military service, emergencies or life threatening situations and work or service which forms part of normal civic obligations."
I'm guessing by "service which forms part of normal civic obligations" - they mean Workfare.
So there you have it - they practically admit Workfare is slavery but as it's 'part of normal civic obligations' - it's A-OK.
21st Century Feudal Britain here we come.