Well, it now appears that all that mysterious speculation about Mr Johnson was pretty irrelevant. He and the other prospective candidates for the top job have decided to leave James Purnell swinging in the wind and seem to have calculated that Gordon will be driven from Number Ten by the election results and the collective fury of Labour MPs. Wait for the Hotmail coup, in other words, and keep those smooth ministerial hands clean of blood. What leadership potential does that conduct suggest? What reserves of courage and principle does Mr Johnson’s behaviour reveal? He has just taken a tasty promotion from a discredited Prime Minister. History will not smile upon that act of shocking self-preservation. All that Postman Pat needed, it turned out, was a pat on the head.