It would once have seemed unimaginable that one of this country’s great institutions, the Post Office, could behave so cruelly and arrogantly. Yet the truth has finally come to light, shattering the public’s faith in the State-run organisation. Last week witnessed what has been described as the biggest miscarriage of justice in recent history. Thirty-nine sub-postmasters and mistresses learnt from the Court of Appeal that judges had overturned convictions for theft, fraud and false accounting that dated back more than a decade. Three who had been falsely accused had since died, shamed and humiliated, while others suffered prison sentences, divorce or bankruptcy.