EDINBURGH, SCOTLAND - APRIL 20:  SNP leader Nicola Sturgeon launches the Scottish National Party manifesto at the Edinburgh International Climbing Arena, EICA Ratho, on April 20, 2015 in Edinburgh, Scotland. Although Labour have rejected a coalition with the SNP, Sturgeon is expected to unveil policies that could lead to a power-sharing deal.  (Photo by Jeff J Mitchell/Getty Images)