Britain's Prime Minister David Cameron speaks with his Canadian counterpart Prime Minister Stephen Harper inside 10 Downing Street, London.
RMGCH2E7Britain's Prime Minister David Cameron speaks with his Canadian counterpart Prime Minister Stephen Harper inside 10 Downing Street, London.
Britain's Prime Minister David Cameron returns to Downing Street
RMDMYAB9Britain's Prime Minister David Cameron returns to Downing Street
Britain's Prime Minister David Cameron (top), his wife Samantha (C) and Deputy Prime Minister Nick Clegg (bottom) attend a thanksgiving service to mark the Queen's Diamond Jubilee at St Paul's Cathedral in central London June 5, 2012. Four days of nationw
RMDJ5FB7Britain's Prime Minister David Cameron (top), his wife Samantha (C) and Deputy Prime Minister Nick Clegg (bottom) attend a thanksgiving service to mark the Queen's Diamond Jubilee at St Paul's Cathedral in central London June 5, 2012. Four days of nationw
Canada's Prime Minister Justin Trudeau, Britain's Prime Minister David Cameron and President of the European Council Donald Tusk (L-R) attend a working session at the Group of 20 (G20) summit in the Mediterranean resort city of Antalya, Turkey, November 15, 2015.   REUTERS/Murad Sezer
RM2CMMRCXCanada's Prime Minister Justin Trudeau, Britain's Prime Minister David Cameron and President of the European Council Donald Tusk (L-R) attend a working session at the Group of 20 (G20) summit in the Mediterranean resort city of Antalya, Turkey, November 15, 2015. REUTERS/Murad Sezer
(150212) -- BRUSSELS, Feb. 12, 2015 (Xinhua) -- Britain's Prime Minister David Cameron arrives at EU headquarters for an EU summit in Brussles, Belgium, Feb. 12, 2015. (Xinhua/Ye Pingfan)
RMEFYN91(150212) -- BRUSSELS, Feb. 12, 2015 (Xinhua) -- Britain's Prime Minister David Cameron arrives at EU headquarters for an EU summit in Brussles, Belgium, Feb. 12, 2015. (Xinhua/Ye Pingfan)
Munich, Germany. 07th Jan, 2016. Britain's Prime Minister David Cameron visits production lines at the BMW manufacturing plant in Munich, Germany, 07 January 2016. Photo: MARC MUELLER/dpa/Alamy Live News
RMFB0X10Munich, Germany. 07th Jan, 2016. Britain's Prime Minister David Cameron visits production lines at the BMW manufacturing plant in Munich, Germany, 07 January 2016. Photo: MARC MUELLER/dpa/Alamy Live News
US President Barack Obama and Britain's Prime Minister David Cameron attend the session on Russia during the NATO summit conference at Lisbon, Portugal, 20 November 2010. Photo: RAINER JENSEN
RMD56FE6US President Barack Obama and Britain's Prime Minister David Cameron attend the session on Russia during the NATO summit conference at Lisbon, Portugal, 20 November 2010. Photo: RAINER JENSEN
Britain's Prime Minister David Cameron speaks with his Canadian counterpart Prime Minister Stephen Harper inside 10 Downing Street, London.
RMGCH2E9Britain's Prime Minister David Cameron speaks with his Canadian counterpart Prime Minister Stephen Harper inside 10 Downing Street, London.
Britain's Prime Minister David Cameron returns to Downing Street
RMDMYAE7Britain's Prime Minister David Cameron returns to Downing Street
Britain's Prime Minister David Cameron (top), his wife Samantha (C) and Deputy Prime Minister Nick Clegg (bottom) attend a thanksgiving service to mark the Queen's Diamond Jubilee at St Paul's Cathedral in central London June 5, 2012. Four days of nationw
RMDJ5FFDBritain's Prime Minister David Cameron (top), his wife Samantha (C) and Deputy Prime Minister Nick Clegg (bottom) attend a thanksgiving service to mark the Queen's Diamond Jubilee at St Paul's Cathedral in central London June 5, 2012. Four days of nationw
Britain's Prime Minister David Cameron and U.S. President Barack Obama arrive at a joint news conference in the East Room of the White House in Washington, May 13, 2013. REUTERS/Jim Bourg (UNITED STATES - Tags: POLITICS)
RM2CM9YGWBritain's Prime Minister David Cameron and U.S. President Barack Obama arrive at a joint news conference in the East Room of the White House in Washington, May 13, 2013. REUTERS/Jim Bourg (UNITED STATES - Tags: POLITICS)
(150212) -- BRUSSELS, Feb. 12, 2015 (Xinhua) -- Britain's Prime Minister David Cameron arrives at EU headquarters for an EU summit in Brussles, Belgium, Feb. 12, 2015. (Xinhua/Ye Pingfan)
RMEFYN97(150212) -- BRUSSELS, Feb. 12, 2015 (Xinhua) -- Britain's Prime Minister David Cameron arrives at EU headquarters for an EU summit in Brussles, Belgium, Feb. 12, 2015. (Xinhua/Ye Pingfan)
Munich, Germany. 07th Jan, 2016. Britain's Prime Minister David Cameron (L) visits production lines at the BMW manufacturing plant in Munich, Germany, 07 January 2016. Photo: MARC MUELLER/dpa/Alamy Live News
RMFB0X13Munich, Germany. 07th Jan, 2016. Britain's Prime Minister David Cameron (L) visits production lines at the BMW manufacturing plant in Munich, Germany, 07 January 2016. Photo: MARC MUELLER/dpa/Alamy Live News