At 43, he is the youngest prime minister since Robert Banks Jenkinson, the 2nd Earl of Liverpool in 1812. He is six months younger than Tony Blair when he entered Downing Street in 1997. Like Mr Blair, he has a young family and an informal, self-consciously modern approach to politics. Mr Blair arrived at Number 10 with a guitar case in hand. Mr Cameron has his cycling helmet on his handlebars and fondness for indie rock. Yet despite opening himself up to the TV cameras like few other British political leaders, Mr Cameron is still something of an unknown quantity.
British Prime Minister David Cameron, left, meets Wimbledon winner Andy Murray in front of No 10