We're forever being told by one or two commentators (chiefly Mike "impartial Lib Dem election expert" Smithson) that the Fixed Term Parliaments Act makes an early election next-to-impossible, almost as if the 2017 election was a collective hallucination. But the reality is that if May decides she wants an election, there'll be one. She'd only need a two-thirds majority in the Commons, and with the support of Labour and the bulk of her own troops, that would be virtually assured. Even if for some reason she fell short, there would be other ways of achieving the same effect - she could instruct Tory MPs to vote against her own government on a motion of no confidence, which would only require a simple majority to succeed, or she could even legislate to repeal the Fixed Term Parliaments Act itself.
Surely, you might think, May would never take the risk of an early election after what happened to her two years ago? If the Sunday Times story is correct (and admittedly that's an extremely big 'if'), I'm not sure there'd be much risk left. If May becomes the first Prime Minister to lose control of parliamentary business, her premiership would be effectively over bar the shouting, and the legacy she expected as the leader who delivered Brexit would be snatched away. A 40% chance of success if she calls a general election would start to look like a better bet than a 100% chance of failure if she doesn't.
What would be the SNP's prospects in a very early, pre-Brexit election? I'd imagine that would depend to a large extent on Labour's manifesto. If, as Corbyn currently insists, Labour fight the election pledging to implement Brexit on the basis of a new fantasy deal with Brussels, I suspect the Scottish Labour vote would collapse and the SNP would be the most likely beneficiaries. But there must be some kind of chance that Corbyn would give in to last-minute pressure to promise a "People's Vote". A lifelong Eurosceptic he may be, but there have already been a number of occasions when he's set that to one side in pursuit of power.
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