In pictures: Cameron's last day as May becomes PM

Michael FallonAFP/Getty Images

Michael Fallon gives photographers a thumbs up as he leaves Number 10 Downing Street after being told he will keep his job as defence secretary.

Amber RuddGetty Images

Amber Rudd, energy and climate change secretary in David Cameron's government, is among those who have been spotted walking into Number 10 Downing Street. She is appointed home secretary.

Boris Johnson arriving at Downing StreetGetty Images

Boris Johnson, who ruled himself out of the running for the Tory leadership two weeks ago, is seen walking into Number 10 Downing Street to meet with the UK's new prime minister. He is appointed foreign secretary.

Philip Hammond at Number 10 Downing StreetAFP/Getty Images

Philip Hammond is the first through the door at Number 10 Downing Street as Mrs May forms her new cabinet. He is appointed chancellor of the exchequer.

Mrs May and Philip May on the steps of number 10AP

Theresa May smiled for the cameras as she arrived in Downing Street to begin her new job as prime minister

Mrs May spoke to the media for the first time as prime minister as she arrived at her official residence at 10 Downing StreetAP

In her first speech in the job she said she wanted to make "Britain work for everyone" and would fight against "burning injustice"

Mr and Mrs May at Number 10AP

Mrs May laughed as Mr May would not be persuaded to kiss his wife for the cameras as he had when she was elected

Mrs May welcomed by staff inside Number 10PA

The 10 Downing Street staff welcomed their new boss with a round of applause

Mrs May with her husband Philip arriving at Downing StreetPA

She arrived to a huge crowd of journalists

Theresa May with the QueenPA

She became PM after accepting an invitation from the Queen to form a new government

Theresa May arriving at Buckingham Palace with her husband Philip MayGetty Images

She arrived at Buckingham Palace with Mr May, following David Cameron's official resignation

David Cameron and his family as he makes his final speech on Downing StreetGetty Images

As his children looked on nervously, Mr Cameron made his final speech before leaving Downing Street as PM saying he believed the UK was "much stronger" than when he started in the job

David Cameron with his family in Downing StreetPA

The world's media gathered to watch the speech

The Cameron family outside Number 10AP

The Camerons had a family hug on the steps of Number 10 which has been their home since 2010

Cameron familyAFP

Mr Cameron and his wife Samantha then walked away hand in hand with their children Elwen, Nancy, and Florence

Florence Cameron, David Cameron's youngest childEPA

Mr Cameron's youngest daughter Florence was born while her father was in office

David Cameron in Downing StreetPA

He took one last look at Downing Street before getting in a car to head to Buckingham Palace to hand his resignation in to the Queen

The House of Commons at Prime Minister's QuestionsPA

Earlier, Mr Cameron received a standing ovation and applause after taking Prime Minister's Questions for the last time