Boris Johnson will officially become Britain’s prime minister on Wednesday with a mission to deliver Brexit by October 31 come what may, while fending off rebellious MPs.

The former foreign secretary, best known for his gaffes, rhetorical flourishes and turbulent love life, was announced as the new leader of the governing Conservative Party on Tuesday.

The 55-year-old will officially take over the reins of power at a meeting with Queen Elizabeth II in Buckingham Palace later on Wednesday and will then give his maiden speech as prime minister outside his new 10 Downing Street home.

Johnson’s predecessor Theresa May was forced out after failing to get parliament to support a Brexit deal she struck with EU leaders that he has promised to overhaul, despite Brussels insisting no changes are possible.