What would Boris Johnson have to do, I wonder, for his critics to take him seriously? For weeks he's been battered by dreadful headlines, culminating in the Mail's revelations of his alleged use of donations to pay for the redecoration of his Downing Street flat. Day after day, his critics hammered away at the issue of so-called sleaze. Then came Thursday, the largest round of local elections since 1973. And the result could hardly have been clearer: another thumping victory for Teflon Boris. Whatever you think of him, Mr Johnson's record speaks for itself. He just keeps on winning. Originally dismissed as a joke candidate, he was twice elected as a Conservative Mayor of supposedly Left-wing London.