British Prime Minister

Government Ministers In Downing Street...LONDON, ENGLAND - APRIL 20:  British Prime Minister David Cameron departs Number 10 Downing Street for the weekly Prime Minister's Question Time (PMQs) session a the Houses Of Commons on April 20, 2016 in London, England. Business continued as normal at Downing Street today ahead of US president Barack Obamas' visit to the United Kingdom.  (Photo by Ben Pruchnie/Getty Images)

Ben Pruchnie/Getty

British Prime Minister David Cameron departs Number 10 Downing Street for the weekly Prime Minister’s Question Time session a the Houses Of Commons in London, England 

British Prime Minister Prime Minister Da...British Prime Minister Prime Minister David Cameron (L) and Mayor of London Boris Johnson wait for a train at Newark station in central England on May 21, 2014, following a visit to the town were they campaigned ahead of the Newark by-election which is due to be held on June 5. Voters also go to the polls in Britain Thursday May 22, 2014, for local council elections in England and Northern Ireland and also for European elections in England, Wales, Scotland and Northern Ireland. AFP PHOTO / STEFAN ROUUSEAU/POOLSTEFAN ROUSSEAU/AFP/Getty Images

Stefan Rousseau/Getty

British prime minister David Cameron and London mayor Boris Johnson wait for a train at Newark station in central England following a visit to the town were they campaigned ahead of the Newark by-election which is to be held on June 5