In the wake of the Mid-Staffordshire hospital scandal, investigations are going on at 14 other hospitals in England identified as having above average death rates among their patients. But why has it taken so long for enquiries to begin? Should the Department of Health and the hospitals regulator, the Care Quality Commission, have sounded the alarm much earlier?

It took a lengthy public inquiry to get to the bottom of failings in Mid-Staffordshire. Complaints of dangerous clinical practice and shoddy nursing standards were overlooked while whistle-blowers were treated as mere troublemakers and threatened with reprisals if they went public with their concerns.

Evidence is now emerging of a similar pattern in other places.

Gerry Northam examines the list of hospitals now under investigation and hears from doctors, nurses, patients and bereaved relatives. Have NHS managers done enough to address concern about high death rates?

How could it happen that the hospital reported to have the highest rate of excess mortality in the country - 20% above the expected level for its population of patients - was given a full seal of approval only three months earlier by the official regulator?

Producer: Rob Cave