And so, the pre-election ball-swinging shoutfest about 'legitimacy' of claim to government seems to be coming down to how much better or worse your party did in 2015, versus 2010.
Huh. In which case, why not cut the crap, and ask SNP to form the next government, since they are forecast to increase their representation by more than 40 seats - twice as many as Labour ... ??