‘Kindly pussycat’? ‘Minister for fun’? ‘A benign uncle?’ This was how Lord Mandelson described himself in that pantomime of an interview with the Guardian earlier this week. But this morning, the Prince of Darkness returned. Perhaps running the government for three days maligned the would-be Widow Twanky of Monday, but it is more likely that Mandy couldn’t resist crossing swords with George Osborne again.