I agree with expat and Gideon. I also think people should read HelenaDove's post. Last Christmas, the internet - including Mumsnet - was teeming with irate Argos employees who'd been told they couldn't have any extra hours as the firm was using workfare to take up the slack. This has been replicated all over the place.
Workfarers can be, and often have been, sanctioned due to unfair complaints from 'providers'.
Think about that word, providers. Your tax money's being used to pay between £300 and £2,500 a time to companies to get free staff, whose subsistence you are also paying. Who wins here?
The "Mandatory Work Programme" is being replaced by a scheme that gives jobcentres unlimited powers to send sick & disabled people on workfare. The press releases say the "Work and Health Programme" hasn't been firmed up yet because there's been an outcry from mental health organisations, pointing out that the already astronomical suicide rate amongst mentally ill claimants is going to become a death programme once sufferers can be made destitute for failing to meet commitments they cannot meet.
People with mental illnesses/disabilities are the group of highest concern, but we've already seen people being told to report for work while they're in hospital (and being sanctioned when they don't turn up) and instructed to stop going for chemotherapy so that they can fulfil workfare.
It seems some folks haven't yet grasped what an insane world we're living in.