Last Cabinet for David Cameron as Theresa May prepares her top team

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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.

May will take up office as Britain's second woman PM on Wednesday, after 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.

Cameron will chair a farewell meeting of Cabinet ministers on Tuesday.

Theresa May (left) is applauded by Conservative MPs outside the Houses of Parliament in Westminster, London, after she secured her place as the UK's second female prime minister through the surprise withdrawal of her only rival in the battle to succeed David Cameron.
(Dominic Lipinski/PA)

After being confirmed as new Tory leader, 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, 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.

Prime Minister David Cameron before speaking to the media outside 10 Downing Street, London, after Theresa May secured her place as the UK's second female prime minister through the surprise withdrawal of her only rival in the battle to succeed him.
(Philip Toscano/PA)

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."

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."