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Embattled Theresa May faces the most catastrophic parliamentary defeat since the Second World War tomorrow.

More than 100 Conservative MPs are expect to inflict a crushing blow on the Prime Minister’ by finally rejecting her Brexit plans.

The devastating defeat would throw the Government - and the country - into unprecedented uncertainty.

Mrs May is expected to make an immediate statement on her Plan B in the minutes following the vote if her deal falls.

Her RAF plane is on standby should she decide to fly straight out to Brussels to beg for yet more concessions to her deal.

But her premiership now hangs in the balance with all eyes on when Labour will choose to table a no confidence vote in her Government.

Downing Street sources did not even rule out the PM quitting after a defeat.

Today, the desperate PM gave one final roll of the dice, warning that no Brexit at all was the “more likely” outcome if her deal is defeated.

In a last-ditch attempt to lure Brexiteers into backing her, she claimed that rejecting her plan could even break up the UK.

But she was on course for a potentially terminal defeat after attempts to get Brussels to to provide more reassurances for sceptical MPs falls flat.

The DUP’s Nigel Dodds warned that far from reassuring his party over the controversial Irish backstop, letters from EU chiefs had heightened their concerns.

“There is nothing new. Nothing has changed. Instead of meaningless letters, the Prime Minister should now ask for and deliver changes to the withdrawal agreement.” he said.

Leading Tory Brexiteer Jacob Rees-Mogg added: “Only change to the withdrawal agreement matters.”

Jeremy Corbyn dismissed the letter from eurocrats Donald Tusk and Jean-Claude Juncker as “warm words and aspirations” which fell short of legal assurances.

“I’m sure members across the House will not be fooled by what has been produced today,” he said.

It came after the PM conceded she “fully understood” the compromises would not go far enough for some MPs.

She confirmed the EU had rejected her demand to set a fixed end date for the backstop.

(Image: PA)

But Mrs May begged more than 100 Tory MPs who have already ruled out backing her deal to give it a second chance.

“Give this deal a second look,” she implored them.

“No, it’s not perfect and yes it’s a compromise. But when the history books are written, people will look at the decision of the House tomorrow and ask: did we deliver on the country’s vote to leave the European Union.

“Did we safeguard our our economy, our security and our union? Or did we let the British people down.”

A furious Mr Corbyn accused the PM of undermining public faith in politics.

“The Government is in disarray. It’s clear, if the Prime Minister’s deal is rejected, it’s time for a general election, it’s time for a new Government,” he added.

In a speech in a factory in Stoke, Mrs May claimed the UK would eventually make a success of leaving without a deal, though she admitted it would cause “significant disruption” first.

And she refused to explicitly rule out delaying Brexit Day or holding a second referendum.

(Image: PA)

“Look, we’re leaving on 29 March. I’ve been clear that I don’t believe we should be extending article 50 and I don’t believe we should be having a second referendum,” she said.

It comes amid claims the EU was preparing to offer the Government a delay of Brexit until at least July if her deal is quashed.

The PM claimed some MPs had changed their minds on her deal. Four Tory switchers announced they would now back her deal, along with four Labour MPs.

She suffered another blow when Tory whip and Brexiteer Gareth Johnson quit the Government so he could vote against the plans.

But groups of MPs were working on their own Plan Bs - with Brexiteers believing that by blocking a deal they could enable a no deal Brexit on March 29.

Trade secretary Liam Fox said: “I don’t regard no deal as national suicide.

This is not Dunkirk, this is leaving the European Union.”

Former Brexit secretary Dominic Raab, who is voting against the plan,

insisted: “We are in a stronger position than our detractors suggest.”

But other cross-party groups, backed by Labour, have warned they will use Parliamentary procedure to try to stop that happening.

Instead they will attempt to seize control back from the Government and give MPs a say on what happens next.

One group said they would hand over control to a panel of senior MPs.

Others were attempting to pave the way for a new referendum.

Two of the leading Tory rebels - former ministers Nick Boles and Dominic Grieve - denied they were launching “a coup” and said Parliament was simply expressing its will.

But the PM’s spokesman said: “Clearly any attempt to prevent the Government from meeting all the legal conditions for an orderly exit at this moment of historic significance is extremely concerning”.

Meanwhile, No 10 sources downplayed the chances of the PM backing an amendment by Tory Andrew Murrison which could put an expiry date on the backstop.

The Government has already thrown its weight behind one from Tory Hugo Swire which includes six conditions on the “insurance policy” to avoid a hard border.

Labour MP Hilary Benn was coming under pressure to withdraw his amendment which could potentially deny MPs the chance to vote on Mrs May’s deal itself.

MPs were waiting for Labour to declare when it would table its motion of no confidence. “The call will be made [on Tuesday] after that vote,” shadow chancellor John McDonnell said.

However, the move has little chance of success unless the DUP, which props up the Tories’ fragile coalition, abstains or votes against.

Meanwhile, GMB union chief Tim Roache called for a delay to article 50 to give more time to get the deal right - and then a second referendum on that deal.

“It’s like trying to do your Christmas shopping at half past 5 on Christmas Eve - everyone will get a load of rubbish or you’ll be in bother for getting nothing at all.

"It’s a no win scenario, which is why we need to stop and take a breath,” he said.