Live Updates: Liz Truss will replace Boris Johnson as British Prime Minister

Liz Truss has won the Conservative Party leadership contest, but will have to wait until Tuesday to formally become prime minister.

Truss and outgoing leader Boris Johnson will travel to Balmoral in Scotland tomorrow to meet with Queen Elizabeth II in accordance with Britain’s unwritten constitution.

The Queen must formally approve the formation of a new government led by Truss. Normally, these meetings would have taken place early at Buckingham Palace, which is a short walk from 10 Downing Street, but the 96-year-old monarch will be staying at his Scottish residence this time.

A royal source told CNN the decision was made at the last minute to avoid alternative arrangements if the Queen experienced any relevant mobility issues.

Once those formalities are complete, Truss will head back to London and reach Downing Street. She will announce her new cabinet, which is likely to be attended by many of her supporters during the contest.

Then on Wednesday Truss will face the prime minister’s questions for the first time.