Party Leaders Campaign To Save The Union

EDINBURGH, SCOTLAND - SEPTEMBER 10: Prime Minister David Cameron speaks to employees including manager Derek Minto (C) during a visit to Baillie Signs in Edinburgh, where he made an impassioned plea to keep Scotland part of the union, saying he would be "heartbroken" if the UK was torn apart on September 10, 2014 in Edinburgh, Scotland. The three UK party leaders are all campaigning in Scotland today showing their support for a "No" vote in the independence referendum. (Photo by James Glossop- WPA Pool /Getty Images)