In the four months since the UK election produced an unexpected majority Tory government, British politics has apparently returned to an earlier era of stable single-party government. The recent election of veteran left-winger Jeremy Corbyn as Labour leader, again by an unexpectedly large margin, has been interpreted by many commentators as entrenching that stability because it has made the Labour Party virtually unelectable. Are we looking at the prospect of ten-to-twenty years of Conservative government? If so, that would contradict some of the political trends we see both in Britain and in similar countries in the English-speaking world. Indeed, the…