A Dire warning today by Lord Ashcroft that the SNP could sweep the board in the election, winning 50+/59 seats -- and even all of them!
http://may2015.com/featured/election-2015-stunning-ashcroft-polls-show-the-snp-could-win-every-seat-in-scotland/
Bot, on the other hand, this is based on the SNP's opponents splitting the opposition vote. The last month or so has seen an interesting campaign to unite the opposition parties and vote tactically against the SNP instead.
If it works, then the resulting change in parliamentary arithmetic could be interesting. In the first place, the Conservatives look set to come second in a handful of seats, tactical voting therefore allowing them to win maybe five Scottish seats -- and a similar number for the Lib Dems. With current UK predictions implying the Tories will be at around 280 seats, an extra five or so wouldn't hurt.
Of course the biggest winner will be Labour, which saved from a total wipeout could win something like 300+ seats instead. Still, at least it would be a Labour government freed of being dragged too far to the left by the SNP...
For interested Scottish voters, the current tactical voting guide is summarised handily in this wheel:
http://tinyurl.com/nmjh4xp
Some links below
http://www.theguardian.com/uk-news/2015/mar/05/scottish-tactical-voting-campaigns-snp-landslide-fears-union-general-election
https://yougov.co.uk/news/2015/04/10/how-tactically-minded-scots-may-affect-election/
http://www.telegraph.co.uk/news/general-election-2015/11533602/Guide-to-tactical-voting-against-the-SNP-published.html