David Huntington’s father, Robert Wilson, was sent to Gosport War Memorial Hospital in 1998 to recover from a broken shoulder and other health problems.

He died two days after being given diamorphine - pure heroin - in large doses.

An inquiry found that he was one of between 450 and 650 patients whose lives were shortened after they were given massive doses of painkillers at the hospital in the 1990s.

Dr Jane Barton, the doctor at the centre of the scandal, was disciplined by the General Medical Council in 2010 for serious professional misconduct, but she was not struck off and retired soon after.

Watch Panorama's "Killed in Hospital", at 8:30pm on BBC One and afterwards on the BBC iPlayer.