Turkeys don’t usually vote for Christmas, so just why have 43 new Labour MPs signed up to the All Party Parliamentary Group (APPG) for Fair Elections and its campaign to replace the first-past-the-post system with proportional representation? These are, after all, the beneficiaries of the most distorted UK election in modern history, where Labour won one of the largest-ever majorities on just 34 per cent of the popular vote – a lower share than any post-war governing party.