Liz Truss was declared the winner of the Conservative leadership race on Monday, garnering votes from 81,326 party members ahead of her rival Rishi Sunak's 60,399 setting in motion a day-long transition to take up the role of prime minister.
The announcement marks the culmination of a six-week campaign for Number 10 which has seen candidates clash over how to address a string of issues facing the UK, most prominently the cost-of-living emergency.
Of the more than 170,000 Tory Party members eligible to vote, 81,326 voted for the trained economist to assume the government's highest office
Queen Elizabeth II is scheduled to formally appoint Truss as Britain’s prime minister on Tuesday.
The ceremony will take place at the queen’s Balmoral estate in Scotland, where the monarch is spending her summer, rather than Buckingham Palace in London.
After a brief address to the Party leadership, Ms Truss moved to the nearby Conservative headquarters where she spent the day consulting on a new cabinet and the promotion or demotion of parliamentary colleagues.
Events on Tuesday kick off with Boris Johnson delivering a farewell speech in Downing Street before heading for a plane to fly to Aberdeen airport. One at the Scottish redoubt, the prime minister will meet the monarch in the Drawing Room and for the first time in history a prime minister will relinquish the role.
After an interval Ms Truss also takes to the air headed to Aberdeen on a separate plane for the formal "kissing hands" meeting to take the seals of office from the Queen.
At lunchtime, Ms Truss is back in the air bound for London and it is believe that on the plane officials will brief her on national security issues.
On arrival back in London she will sweep into Downing Street, stopping outside the black door to make her first speech as first lord of the treasury to set out her government's direction.
The Cabinet appointments and liaision with civil servants will take up the remainder of the day.
Foremost will be the appointments to the great offices of state — chancellor of the exchequer, foreign secretary and home secretary. Then will come the other senior Cabinet posts, totalling 28 people.
Slightly fewer than 100 junior ministerial posts will be dished out to those she considers having the competence and ability to serve her.