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Labour MP Peter Kyle asks whether it's true that no prime minister is better than a bad prime minister.

Mrs May says every MP has stood on a manifesto pledge to deliver Brexit, and they have a duty to do that.

Wales First Minister Carwyn Jones says: "Shambles is too polite a word for what we have seen today from the prime minister.

"The future economic security of this country is being sacrificed on the altar of her party's needs. This cannot carry on.

"If the prime minister cannot bring forward a deal that commands the support of Parliament, there needs to be a general election.

"If there isn't a general election, there needs to be a people's vote on the terms on which the UK leaves - or if the country wishes to remain."

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Scottish Tory MP Douglas Ross says he hopes the government has listened to the Speaker and will give MPs the opportunity to express their views. He says he cannot support the prime minister in her deal.

MPs and their constituents deserve to know when the vote will take place, he says, "when will it be?"

Theresa May says she will be going to seek further discussions with the EU and until those discussions have started it's not possible to say when the vote will be.

Reference has already been made to the date of 21 January, she says, and she wants to work as "quickly and urgently" as possible.

It's not possible to give a date until the negotiations have happened, she says.

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Conservative MP Jo Johnson says "the problem with the deal goes far beyond the backstop."

He asks the prime minister what she plans to do about the government's own economic analysis, which shows that every region of the UK is going to be poorer under Brexit "with less say over swathes of our economy than we have at the moment".

Theresa May says the government's economic analysis shows that "this deal does not make us poorer than we are today."

"It shows us that if you want to honour the result of the referendum, the best deal is this one," she concludes.

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Conservative MP Justine Greening says on discussion with the library, the requirement for a statement from the prime minister in the case of a no deal to be made by 21 January has been superseded because of her statement today.

She says in this view "the latest we could have the meaningful vote would be 28 March".

Ms Greening asks the prime minister whether this is what she intends, and that the delay of the meaningful vote "is a matter of days not months".

Theresa May says "I do not believe the scenario she has set out is the right one, but we are conscious of the requirements this places on us."

She adds that 21 January has been set in legislation as the latest point for a vote, but again declines to say when meaningful vote will come before MPs.

Image source, Reuters/Clodagh Kilcoyne

Sinn Féin president Mary-Lou McDonald has responded to today's events.

"Theresa May and the British Parliament are deluding themselves if they think that Irish interests will simply be cast aside to facilitate the fantasy Brexit they are pursuing," she said.

"The Irish government and the EU need to stand by their commitments and defend Irish interests; there can be no hard border, no diminution of our rights and protection for the Good Friday Agreement in all its parts."

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Conservative Peter Bone asks what procedure the government will be using to postpone the votes which have been agreed on the deal.

Mrs May says it is "important" for the government to listen to the comments made on the deal. She says it is "responsible" to do what it can to get the deal "over the line".

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Labour MP Pat McFadden says the prime minister is calling for honesty on a day that she tried to pull a vote she promised wouldn't be pulled, in order to try and change a deal she said couldn't be changed.

He calls on the prime minister to be honest about the commitments made to no hard border on the island of Ireland, to the Good Friday Agreement and on to not doing any huge damage to the economy.

Any deal that respects these commitments requires the UK to sign up to a set of common European rules, he adds, over which the UK will have no say.

"Isn't it time to be honest about this instead of trying to square unsquarable circles or, even worse, hide the facts of this fundamental choice until after we're out?" he asks.

Mrs May says the government is committed to no hard border, to protecting the Good Friday Agreement, and have reached a deal that protects people's jobs and livelihood.

She says Mr McFadden can argue what he has, and the government has set out that if you want to reduce customs checks then you need to reach agreements. They proposed that, but with a lock on these agreements in the form of a parliamentary vote.

The government has been honest about the consequences if the agreements aren't supported, she says.

France's European affairs minister Nathalie Loiseau says a rejection of the withdrawal agreement is now more likely.

"The risk of a no deal exit would also be an exit that would be undoubtedly extremely costly for the United Kingdom but which would be damaging for the EU too," she added.

"Some are drawing up other scenarios and the confusion in London remains particularly strong."

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Labour's Seema Malhotra says that it is an "even bigger farce" that the government has paid £100,000 for adverts on social media companies to promote the deal, which has now been abandoned by the prime minister herself.

She asks why the government is making social media companies richer.

Mrs May says this is "the right deal for the United Kingdom".

Some MPs laugh after the prime minister says there is "broad support" for much of the Brexit deal she had negotiated.

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Labour MP Jess Phillips questions why the prime minister is going back to the EU to negotiate "minutiae" of the backstop when "it will make no difference to a group of people in her party who refer to themselves as Aslan and are circling around her head."

On Sunday's Andrew Marr show, Boris Johnson revealed that his friends liken him to Aslan in CS Lewis's Narnia series.

Theresa May says "there is a consensus across this House that there are concerns with the backstop, and it is entirely right that the government addresses it."

The Labour leader says Theresa May's government is "shambolic" and in "disarray" over the Brexit talks and timings.

The House of Commons officials have confirmed on Twitter, external that the latest possible date for a meaningful vote by MPs on the withdrawal agreement is 28 March, the day before the UK is due to leave the EU.