Problem is, having spent a lot of my time in Glasgow, that the SNP actually face an uphill job, the majority of the Scottish don't actually want independance from the UK, they just want Parliament to stop thinking that, as Kara stated, the United Kingdom ended at Watford. Most Scottish people I've spoken to don't have a problem with saying they are British, regardless of what the media may have us think, but they also are Scottish and that's fine, I'm British and was born in England, it's the same thing.
That said, since Glasgow is also the only place in the world I've ever had racism directed at me, the sad fact is that a lot of people are still convinced they are re-living Braveheart, my family came from the Midlands, we got rolled over by the English King on the way up and the Scottish King on the way down, so we don't really owe either side any favours if we chose to hold grudges for hundreds of years. The problem isn't really one of sovereign rule, hasn't been for hundresd of years, the problem is how to decentralise the power system that has formed in London.