Laura Kuenssberg
BBC political editor

The prime minister has told MPs that she will resign before the next phase of Brexit negotiations.

No exact date for her departure has been given but a leadership election could be expected around May.

Here's more from Conservative MP James Cartlidge. He has been speaking to the BBC's Norman Smith about what Theresa May has just told MPs about her future.

"My recollection is that she said she would not remain in post for the next phase of the negotiations, the implication being that once the withdrawal agreement has passed, she would make way for someone else," he said.

This from the BBC's Norman Smith.

Conservative MP James Cartilage has told the BBC that Mrs May told the 1922 Committee she will not be leader for next phase of Brexit negotiations.

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Parliament

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Labour MP Yvette Cooper says "constituents are tearing their hair out" over what is going on.

There is the basis to form some kind of compromise, she says, adding: "It's in all of our interest to build consensus and do what we should have done two years ago."

The former cabinet minister says this is the only path to a lasting solution, and urges MPs to come together.

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Parliament

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SNP's Westminster Leader Ian Blackford has become a familiar figure on these big parliamentary occasions and it is now his opportunity to speak.

He says MPs must act now to protect the interests of UK citizens.

"I want the EU to keep a light on for Scotland," he says. "MPs must decide, can we follow that light or is the UK heading into darkness?"

He says the SNP will vote for another referendum and for motions to revoke Article 50, adding that "these options must be left on the table."

"Revoke must be an option," he reiterates, adding: "Let us end this stalemate by letting the people decide."

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Parliament

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The Conservative benches (on the left) are looking a little empty at the moment.

This could be because Theresa May is currently addressing a meeting of the 1922 committee of Tory backbenchers. As rival attractions go, that is quite a big one.

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Parliament

Back in the Commons, Conservative Marcus Fysh was speaking a few minutes ago to his amendment.

This would implement a proposal known as 'Malthouse B', named after the Conservative MP Kit Malthouse, which seeks a Brexit compromise acceptable to various Tory factions.

Under this plan, the UK would leave the EU and there would be a commitment from both sides to recognise each other's standards and regulations for up to two years.

Mr Fysh says his plan is "simple to agree, doesn't prejudice the future relationship with the EU, is pro-trade, is pro-business and honours the referendum".

Away from the Commons chamber, the prime minister is now addressing the 1922 Committee of Conservative backbenchers. It has been billed in advance as a very important, potentially make-or-break, speech.

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MPs will vote on a range of Brexit options this evening - but what are they?

Here's a run down of the eight options.

There is a lot of praise on Twitter for Dame Margaret Beckett's speech in the Commons earlier - mainly from people who support another referendum.

Among those commending her is the former Formula One motor racing champion Damon Hill.

Dame Margaret has tabled the "confirmatory public vote" proposal - which is seventh on the list of tonight's votes. Her proposal would basically require Parliament to withhold its consent for any Brexit deal until it is approved in a referendum.

Phil Wilson - who was one of the MPs behind the idea of the confirmatory public vote - also tweeted:

Former Labour MP Chuka Umunna, who quit to join the Independent Group of MPs, called the speech "fantastic".

Outside of politics, British former racing driver Damon Hill also tweeted praise

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Maddy Thimont Jack, from the non-partisan think tank The Institute for Government, says the aim of today's process is to try "to get to a position where MPs are willing to compromise".

This mean them "not necessarily voting for their first preference, but actually being willing to potentially vote for something that's not what they really, really want but they’re OK with".

"I think that’s what we’re hoping more MPs will be willing to do during this process - to try and get closer to knowing where a majority might lie.

The BBC's Simon McCoy suggests: “So it’s a bit like voting for Switzerland at Eurovision is it? You don’t want them to win but you’re happy to give them a few?"

Ms Thimont Jack agrees in part with this, saying the job of MPs is to identify something they are "willing to live with it because it’s the best chance we’ve got at this stage in the process."

For the record, Switzerland has won Eurovision twice - the inaugural contest in 1956 and Celine Dion's triumph in 1988.

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Parliament

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Labour MP Hilary Benn, who chairs the Brexit select committee, says the nature of today's debate is "really quite liberating".

He likes the fact that MPs are making positive arguments for what they believe in rather than just talking down others.

He says he will be voting in favour of the motions to legislate for a customs union with the EU, and for a confirmatory referendum on any Brexit deal.

He adds that he will also support the motion calling for a "Common Market 2.0" - Labour is "recommending" its MPs support it, but will not be ordering them to do so.

The House of Commons has tweeted a video of John Bercow explaining how MPs wanting to speak try to "catch his eye".