And JTC, the SNP are polling in the high 50s for Holyrood and Westminster.

It’s likely that the SNP and Greens combined will take more than 60% of the vote at Holyrood next May.

Polls are only a indication of how people are thinking at the moment in time. Also they can be skewed by asking a question a certain way or asking a certain type of person.You held pole position on the grid in 14.
That will be 60% thinking the SNP and Greens are best in Scotland (if it happens).Not the best in the UK or saying they want a Indy ref . Of course they will attach a Indy ref to their policy, they have to.I doubt that will be why X amount will be voting for them though
Think about it. In England people have voted the Tories as the main party. Do you seriously think a lot want to vote Tory?The stark fact is a decent amount would not but faced ( pre CV) with a choice of Tories or a plan off Labour which seems extreme to a lot of their natural supporters they vote Tory because what they have they want to keep and basically are not prepared to risk their house and job on a unproven set of policies in the U.K.They have probably noticed when the said policies have been tried elsewhere they have brought a disastrous result .