On June 22 local time, UK Prime Minister Keir Starmer announced his resignation. Since the 2016 Brexit referendum, the United Kingdom has entered a prolonged period of political turbulence, with successive prime ministers stepping down one after another, turning 10 Downing Street into what observers describe as a "revolving door of politics." According to statistics, since 1835, the average tenure of UK prime ministers has been about 1,368 days.  [...]