If recent years have taught us anything, it is that the best-laid polling predictions gang aft agley. Predicting the headline results from general elections in Scotland was once a relatively safe bet. The recurring battle for Scottish seats was traditionally played out on a broadly left-right political axis and dominated by UK parties. For more than half a century Labour returned the most Scottish MPs to Westminster. This domination peaked in 1997, when the party won more than three-quarters of seats north of the Border.