Was it only five weeks ago that Conservatives believed the prime minister was the only possible answer to their problems, asks Guardian columnist Marina Hyde......" As a dispatch box artiste, Johnson has all the accomplishment of one of those pisshead chancers who go house to house at 10pm in December and “carol sing” for pub money. His delivery was that of a man finding out in real time that material which slayed at the accountancy corporate he did in 2007 is less well received by those who haven’t drunk themselves to within an hour of renal failure.