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INVERNESS, SCOTLAND - MAY 02: First Minister and leader of the SNP Nicola Sturgeon and Scottish National Party councillor and Council Leader Drew Hendry wave as they visit by helicopter as she campaigns on May 2, 2015 in Inverness, Scotland. Continuing her helicopter tour of Scotland, First Minister Nicola Sturgeon said that Ed Miliband's revelation that he is prepared to let the Tories back into office rather than work with the SNP has shown that it is only the SNP that can be trusted to deliver progressive politics. (Photo by Jeff J Mitchell/Getty Images)

INVERNESS, SCOTLAND - MAY 02:  First Minister and leader of the SNP Nicola Sturgeon and Scottish National Party councillor and Council Leader Drew Hendry wave as they visit by helicopter as she campaigns on May 2, 2015 in Inverness, Scotland. Continuing her helicopter tour of Scotland, First Minister Nicola Sturgeon said that Ed Miliband's revelation that he is prepared to let the Tories back into office rather than work with the SNP has shown that it is only the SNP that can be trusted to deliver progressive politics.  (Photo by Jeff J Mitchell/Getty Images)