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Theresa May's Premiership - not Brexit - might be entering the endgame after Jeremy Corbyn wiped the floor with her in the House of Commons.

Her plan looks dead on arrival when the Labour leader made crystal clear his party will vote against it alongside Brextremist rebels and, at the moment, DUP MPs in what would be a fatal personal blow.

Corbyn's accusation that May's posing a false choice between a botched deal and no deal that's a failure on its own terms following two years of bungled negotiations hurt because it's largely true.

Picking at sovereignty and trade deal sores, this was the best Prime Minister's Questions performance for months from a Labour leader who mocked her and Brexit Secretary Dominic Raab's discovery of the importance of the Dover-Calais route to and from the Continent.

The usual Tory wall of noise behind May was largely quelled and her dig at Labour splits, Corbyn asserting Brexit can't be stopped and Shadow Brexit Secretary Keir Starmer insisting it can, lacked sharpness as Corbyn gave himself wriggle room by arguing he wouldn't frustrate it but he would oppose a Tory mess.

This is a colossal crisis for Britain and not just May when her effective deputy David Lidington earlier today admitted the Brexit he's supporting would leave the country worse off.

How fiercely May's fighting on two fronts, caught in a Remainer-Quitter pincer movement, was reinforced by Brextremist Tory Peter Bone warning she'd lose support of their party's MPs and millions of voters.

Caught between a rock and a hard place, negotiating with her fractious Cabinet then winning a vote in Parliament will be tougher than securing from 27 European neighbours the friendless Brexit withdrawal deal unloved before all 500 pages are published.