By Matthew Lesh The Post Office scandal is a shocking example of how arms-length bodies allow government to escape accountability, writes Matthew Lesh ITV’s hit drama about the sub-postmaster scandal Mr Bates vs The Post Office is gut-wrenching television. It’s a David and Goliath story that pits local shop owners, stalwarts of their community, against a broken computer programme and powerful institutional forces. Sub-postmasters are repeatedly told that they owe money to the Post Office, are the only ones, and are then viciously prosecuted for wrongdoing that never happened. This scandal ruin…