David Cameron is preparing for his final Cabinet meeting as Prime Minister as his successor Theresa May mulls over who to appoint to her top team.
Mrs May will take up office as Britain's second woman PM on Wednesday, after Mr Cameron answers MPs' questions in the House of Commons for the last time and goes to Buckingham Palace to offer his resignation to the Queen.
Mr Cameron will chair a farewell meeting of Cabinet ministers on Tuesday.
After being confirmed as new Tory leader, Mrs May was left with around 48 hours to put together a new team to lead the Government, with Chancellor George Osborne's position thought to be under threat after the historic vote to leave the European Union.
Observers will be keen to see how the Home Secretary handles Brexit-backing Tories such as Boris Johnson, Michael Gove and Andrea Leadsom, who handed her the keys to No 10 by pulling out of the leadership race on Monday after a torrid few days of negative headlines.
Even before arriving at 10 Downing Street, Mrs May was facing calls for a snap general election from Labour, who said it was "crucial" that the UK has a "democratically-elected prime minister" at a time of economic and political instability.
Mrs May moved to reassure Eurosceptic Tories that "Brexit means Brexit" and that she will pull the country out of the EU despite being a Remain supporter during the EU referendum campaign.
And she set out her One Nation vision of "a country that works not for the privileged few, but that works for every one of us", adding: "We are going to give people more control over their lives and that's how together we will build a better Britain."
Mrs May set her face against a snap election when she launched her campaign for the Tory leadership on June 30, saying: "There should be no general election until 2020."
But other parties are likely to remind her of Mr Cameron's demand for an immediate election in 2007 on the grounds that Tony Blair's successor Gordon Brown "doesn't have the mandate (and) wasn't elected as prime minister".
But her backers such as Commons Leader Chris Grayling stressed that Mrs May was a senior member in the Tory team which won a majority at the 2015 general election.
Mr Cameron, meanwhile, said he was "delighted" that 59-year-old Mrs May would replace him in Downing Street.
Speaking outside No 10 on Monday, he said: "She is strong, she is competent, she is more than able to provide the leadership that our country is going to need in the years ahead and she will have my full support."
He appeared sanguine at the prospect of leaving Downing Street, singing a short tune as he entered No 10's famous front door after outlining the plan for succession.