The net seems to be tightening on Andy Coulson, at least according to political punters on the social betting site Smarkets. Back in October, when the New York Times did its bit to unmask widespread phone hacking at the News of the World, the clever money was that Coulson would stay: 79% of Smarkets users thought (correctly) that he would outlast 2010. Significantly, perhaps, the odds on Smarkets are set by members of the site and not by a professional bookmaker. Today, the same site has spun the tables on Cameron’s head of communications, and is offering a 74% probability that Coulson will “leave his position” in 2011. Surely now more a case of when, not if.