Britain's Prime Minister David Cameron gestures as he speaks during a visit to the Scottish Widows building in Edinburgh, Scotland September 10, 2014. Cameron said on Wednesday that he would be heartbroken if Scots vote in next week's referendum on independence to tear apart the family of the nations of the United Kingdom. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Andrew Milligan/pool (BRITAIN - Tags: POLITICS ELECTIONS BUSINESS)