AYLESBURY, UNITED KINGDOM - OCTOBER 9: Prime Minister David Cameron (R) greets German Chancellor Angela Merkel (L) as he meets with her at Chequers, the Prime Minister's country residence on October 9, 2015 near Aylesbury, Buckinghamshire, United Kingdom. The meeting between the two leaders is expected to focus on Britain's EU renegotiation aims.  (Photo by Justin Tallis-Pool/Getty Images)