In the past decade, Britain has churned through leaders faster than the average fringe revolutionary sect. Earlier today, Keir Starmer became the sixth prime minister to announce his resignation since 2016. He managed just over 700 days in power. Departures from Downing Street have become so frequent that Starmer’s announcement followed a well-established grammar: A lectern was dragged in front of the black door of Number 10, the doomed leader’s loyal staff gathered at the side of the road, and