18 July, 2016
"Nothing is really impossible if you put your mind to it. After all, as I once said, I was the future, once", he said.
Speaking about the former Home Secretary, he said she will provide "strong and stable" leadership and he was delighted that she is to become the second female Prime Minister.
"When I first stood here in Downing Street in that evening in May 2010 I said we would confront our problems as a country and lead people through hard divisions so that together we could reach better times", Cameron said.
Addressing the waiting media before heading to Buckingham Palace, Cameron sought to paint a positive picture of his time in office, despite it ending suddenly after the European Union referendum result.
May arrived at Buckingham Palace shortly afterward to be confirmed as British prime minister.
During a generally light-hearted and jocular session of Prime Minister's Questions, Mr Cameron said he had clocked up 5,500 questions at the despatch box, joking that he would leave it to others to decide how many he has answered.
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After six years as leader, Mr Cameron will formally hand in his resignation to Queen Elizabeth later on Wednesday, passing control of the country to fellow Conservative Theresa May, who will be in charge of negotiating Britain's exit from the EU. All Twitter could talk about was how sweet she looked as Daddy Cameron made his final speech: Florence is the youngest of David and Samantha Cameron's four children.
As soon as Cameron departed from the palace a spokesman for the Queen issued a formal statement stating that the monarch had "graciously accepted the resignation of the prime minister".
Despite the serious backdrop, there was an atmosphere of hilarity in parliament as Cameron traded humorous jabs with beleaguered opposition Labour Party leader Jeremy Corbyn.
She said: "Not everybody knows this, but the full title of my party is the Conservative and Unionist Party, and that word unionist is very important to me".
Mrs May suddenly won the Conservative leadership contest after rival candidate Andrea Leadsom pulled out on Monday.
During his six years at 10 Downing Street Larry has met with a number of world leaders, most notably US President Barack Obama.