As I said in my earlier post the political position of the SNP is another argument altogther.
FWIW
the 'broad church' that is the SNP is a social democratic left of centre party and, for that matter so, is Alex Salmond (it would be a good idea for you to do some web surfing on the SNP '79 group - AS was a founding member and was even expelled by the party for being a 'leftie').
You should also check out SNP policies before having a go at them based on their voting record against a right of centre New Labour Government. Here's a wee sample, are these poilcies not left of centre:-
No to the wars in Iraq and Afghanistan
No to the renewal of Trident WMD
No new council house sales
A progressive tax system based on ability to pay
If you need anymore convincing you can check out their manifestos at
www.snp.org