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The best way to get away with it would be to have a general election and win - risky but likely.
Have an election quickly and claim that you wish to have 'a democratic mandate', while the real motivation would be to get it in before all those promises are obviously broken, and the opposition is disorganised. Corbyn won't be Labour leader for ever!
Whatever the outcome, he's now guaranteed the Prime Minister's (substantial) pension for life.
It is so insanely depressing that you can genuinely imagine that happening. And him getting away with it.