File on 4 uncovers the story behind the collapse of one of the biggest health contracts ever put out to tender. Last April an NHS consortium of Cambridge University Hospitals and Cambridgeshire and Peterborough NHS Foundation Trust successfully bid to run older peoples' health services. But in December the £800m, five year contract ended without warning, with local commissioners saying only that it was "no longer financially sustainable." Jane Deith asks what the failure of the Cambridgeshire contract means for the broader policy of trying to improve NHS services by opening massive contracts to competition between Trusts and the private sector. Reporter: Jane Deith Producer: Ian Muir-Cochrane.