In the coffee shops and bars of Britain's Parliament, the political conversation has already turned to the question that will define the country's immediate future: Can Boris Johnson be stopped from pursuing a no-deal Brexit?
The options under discussion for Conservative politicians who want to avoid a no-deal split from the European Union are dramatic. They include quitting the party and mounting a rebellion to bring down the government.
The contest to succeed Theresa May as prime minister has seen a hardening of rhetoric around leaving the European Union. Johnson, the front-runner, and his rival to be prime minister, Jeremy Hunt, argue that only by threatening to leave the EU without an agreement can Britain get a good deal.