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DUNDEE, SCOTLAND APRIL 29 : The Scottish Conservative Leader Ruth Davidson gets behind the controls of a Tank at Auchterhouse Country Sports, as she highlights how the country's military and defences are best served by the party on April 29, 2015 in Dundee, Scotland. Britain goes to the polls in a General Election on May 7. (Photo by Mark Runnacles/Getty Images)

DUNDEE, SCOTLAND APRIL 29 : The Scottish Conservative Leader Ruth Davidson gets behind the controls of a Tank at Auchterhouse Country Sports, as she highlights how the country's military and defences are best served by the party on April 29, 2015 in Dundee, Scotland. Britain goes to the polls in a General Election on May 7. (Photo by Mark Runnacles/Getty Images)