The PM explains the European Union rejected her request for a time limit to the backstop as part of her deal - and today she has rejected their suggestion that Article 50 could be extended:

"I don't think we should be extending Article 50 and I don't think we should be having another referendum," she said.

Asked by the BBC's political editor Laura Kuenssberg if she really thinks her deal can pass in the Commons tomorrow, Mrs May said:

"I've been speaking to MPs over the weekend and I'll be back in Parliament today and tomorrow.

"I have seen MPs when I've spoken to them recognising the importance of the deal and saying they will vote for it when in the past they had some doubts about it."

The British people are "ready for us to move on" and go from uncertainty to a "brighter future".

She said that is what MPs have to decide on tomorrow - urging them to vote for her deal as she ends her speech.

The prime minister says the letters from the EU published today have legal force.

Mrs May tells those MPs hoping for another referendum that failing to deliver Brexit would "send a message from Westminster to places like Stoke that their voices don't matter".

Speaking from a factory in Stoke, the prime minister said: "I've always believed that while we could make a success of no deal, it would cause significant disruption in the short term."

She added: "The only deal on the table is the one MPs will vote on tomorrow."

Watch Theresa May's speech live on the BBC News Channel

Ahead of her speech, the PM has also published her letter, external to EU chiefs Mr Juncker and Mr Tusk requesting further assurances on the backstop.

Mrs May wrote: "The clarifications and undertakings proposed in this letter are consistent with the letter and spirit of the deal we have reached, but would be further reassurance that the fears that some hold on both sides are misplaced."

Image source, PA

Image source, PA

The Welsh town of Llanelli overwhelmingly voted for Brexit in the 2016 referendum.

But now major employer, a German-owned factory, has decided to leave the town. So what do residents make of Brexit now?

That letter from EU Commission president Jean-Claude Juncker and president of the European Council Donald Tusk has been published., external

Supposedly providing assurances and "clarifications" over the PM's deal, it appears not much has changed.

Mr Juncker and Mr Tusk reiterate the EU is "not in a position to agree to anything that changes or is inconsistent with the withdrawal agreement".

However, their letter does stress the EU's commitment to reaching a trade deal that is in place by 31 December 2020 "so that the backstop will not need to be triggered".

Image source, PA

The prime minister has just arrived in Stoke on Trent to speak to factory workers - and make a last-ditch attempt to secure support from MPs for her Brexit deal.

The speech is being described as the start of the most momentous week in parliament since World War II. Mrs May will warn MPs that if they don't support her withdrawal bill on Tuesday, parliament might stop the UK leaving the EU.

Follow updates here on the live page and read the full story here.

Critics of the PM's proposition that the Welsh Assembly was not "seriously" questioned after the 1997 devolution referendum say Mrs May has got her facts wrong.

Mrs May says she is using the example to explain why MPs should not question the EU referendum.

In fact she herself voted against the law that created the Welsh Assembly - after the referendum was held.

Labour MP for Cardiff Central Jo Stevens said the development had exposed "yet more utter hypocrisy from the PM".

A Plaid Cymru source told the BBC it was "revisionist history" and "hypocrisy of the highest order".

Cardiff South & Penarth MP Stephen Doughty said: "This is a very strange example for the PM to use - not least given she herself voted against implementing the Welsh referendum result, and the Tories continued to oppose it for years afterwards."

Labour AM Alun Davies said the briefed remarks show "ignorance and incompetence in equal measure".

"It is a perfect metaphor for Brexit," he added.

Image source, Getty Images

Norman Smith
Assistant political editor

BBC assistant political editor Norman Smith has told the Victoria Derbyshire programme that, following the expected defeat of Mrs May's deal tomorrow, he sees two scenarios as "front runners".

He said: "I think what we're going to get over the next week or so is a sort of shake-out of some of the options.

"I think Mrs May's deal will go, I think no-deal will go.

"Then you're moving towards a situation where the two front runners become a softer sort of Brexit - some sort of customs union, Norway sort of option - or a second referendum.

"Those seem to me to be the two contenders."

Peter Barnes
BBC political analyst

MPs are to get their say on Mrs May's Brexit deal on Tuesday - five weeks after the vote was postponed because the government seemed likely to lose.

So what would happen if the Brexit deal is rejected?

Secretary of State for International Trade Liam Fox plans to vote for the PM's deal tomorrow - but doesn't believe enough of his colleagues will vote for it to pass.