With his devastating essay about Labour’s failings, the former prime minister has shown himself still capable of stoking a national debate and dividing opinion, two decades after he left Downing Street – but there’s a good reason why he won’t be coming back for good, says Sean O’Grady I have to say there’s been a startling, if fanciful, amount of chatter out there in recent days about bringing back Tony Blair as prime minister. The tremendous fuss about his 5,000+-word essay outlining the mess