How safe are we in the hands of locum staff at NHS hospitals? The Government's crackdown on big fees charged by agencies that hire them out has been making headlines, but what's being done to ensure they are up to the job? Allan Urry investigates recent cases which raise questions about the quality of care delivered by some temporary staff. Should an agency doctor have better assessed a poorly surgical patient on his ward who died a short time later from a post -operative bleed? The programme also asks how well the agency sector is regulated following the revelation that a partly-qualified doctor was able to treat more than 3000 patients after lying about his qualifications. Reporter: Allan Urry Producer: David Lewis.