Oppositions don’t win elections, received Westminster wisdom tells us. Governments lose them. And in Britain’s July 4 election, the ruling Conservatives lost big. After a 14-year governing streak defined by Brexit, a pandemic, and an astonishing period of political and financial turbulence that ushered in three Prime Ministers in just one year, the world’s most successful political party—which since 1945 has been in power twice as long as it’s been out of it—has been shunted back into opposition.