EDINBURGH, SCOTLAND - APRIL 07:  Scottish Conservative leader Ruth Davidson speaks during the Scottish Television Debate at the Assembly Rooms on April 7, 2015 in Edinburgh, Scotland. Moderated by STV political editor Bernard Ponsonby, tonight's live televised debate will be the first time the public have had the chance to see the major party leaders in Scotland go head to head.  (Photo by Jeff J Mitchell/Getty Images)