A Panorama investigation reveals how police, politicians, lawyers and judges all played a part in burying the truth about Britain's worst football disaster. Never-before-broadcast footage of the FA Cup semi-final in which 96 Liverpool fans died reveals a catastrophic failure by the emergency services, how lives might have been saved and how subsequent inquiries were misled. And a former home secretary and former police chiefs are put on the spot about why a succession of official investigations left the truth hidden for a generation.