Nicola Sturgeon. Ah well ... ... no surprises there - and (hopefully) even less chance of Cameron doing a 'U~turn' on his promise to enact additional devolved powers for Scotland.
... that does surprise me, as she's been an ardent SNP activist since the age of 21 - is now 44 - and became Alex Salmond's Deputy when the Nationalists gained control north of the border in 2007.