What makes this one especially interesting is that Britain is supposed to have moved to fixed terms - May will need the permission of the House of Commons to call this election, and it basically makes a mockery of the fixed term ‘reform’ forced on David Cameron by the LibDems when he had to form a coalition.
The Fixed Term Parliaments Act was a dumb idea in the first place. In a Westminster style Parliament flexibility for the timing of an election can keep both sides honest.
In this case Labour are going to pay dearly for having Jeremy Corbin as a leader. But he will be forced out after a near certain loss and the UK can get a functioning opposition again.
Policies aside, Corbin has been a poor leader who has divided his party against itself. He needs to go for Labour to rebuild.
The Tories will get a solid mandate to finish withdrawl from the EU.
The Lib Dems and UKIP will get to sort out their future