Why did it take a TV drama to wake politicians up to what’s been described as the most widespread miscarriage of justice in British legal history? More than 700 sub-postmasters were convicted of theft, due to accounting discrepancies caused by the Post Office’s faulty computer system. ITV’s Mr Bates vs The Post Office caused public outrage and has forced the Government into taking unprecedented action. James Harding, former BBC director of News and Current Affairs, joins Nish and Coco to discuss what lessons journalism can learn from the saga.