This is the amendment causing all the fuss, but sounds quite technical.

So what's going on?

The government has already agreed to give Parliament a vote on the deal it makes with the EU. This amendment is about what kind of vote that is.

As it stands, the vote is "take it or leave it" - MPs can either accept the deal or reject it, in which case the UK would be facing leaving the EU without a deal. Ministers would be obliged to brief MPs on their next plans, but MPs would not have control over what these plans would be.

The Lords amendment (19) would change the process if MPs were to reject the deal, giving MPs the power to direct what the government does next.

The government rejects this idea on the grounds that it would curtail its prerogative powers to negotiate international agreements.

See more about the government's response to the amendment.

What will the decisions on the EU Withdrawal Bill mean, as MPs debate Lords amendments?

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Image source, HoC

Shadow exiting the EU minister Matthew Pennycook says the aim of the Lords amendments "is not to frustrate Brexit", adding that it is "disingenuous" to suggest that members of the Commons want to prevent the process of the UK leaving the EU.

"It is about giving Parliament a say" on the final deal, he says.

The SNP's Angus MacNeil intervenes to say that the European Parliament will be able to have a vote on the final deal, but it is possible that the Parliament in the country that is leaving will not have such a say.

"It is not about Parliament taking over the decisions," continues Mr Pennycook.

He adds that at the point of leaving there is an unknown number "of hypothetical situations" that could occur, the amendments seek to ensure that Parliament does not become "a passive spectator" during the process.

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When chair Damian Collins calls for one final set of questions, Arron Banks protests that he and Andy Wigmore have "got a lunch appointment we don't want to be late for".

"You can join us if you want, we'll be in the House of Commons bar," says Mr Wigmore.

Arron Banks says the chair promised there would only be another 20 minutes after the vote "and we've run way past 20 minutes".

Damian Collins asks for "five minutes" but Arron Banks says "no no no no, the word is no", stands up and leaves the room, bringing the session to a close.

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Matthew Pennycook, shadow minister for exiting the EU, calls the original bill "fundamentally flawed" but says government concessions and Lords amendments have ameliorated its worst parts.

Labour's Wes Streeting intervenes to take a shot at Boris Johnson for "undermining" the PM's negotiating position.

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The first round of votes will take place around 4.15pm and will cover Lords amendments which:

• give the sifting committee powers to oversee all statutory instruments used to amend retained EU law
• exclude the details of Brexit date and time from the bill
• give MPs the power to direct the government in their actions if MPs reject the final deal or no deal is reached
• prevent ministers using secondary legislation to establish when individuals can challenge the validity of retained EU law after exit
• ensure ministers can only use delegated powers to amend retained EU law where "necessary" rather than where they deem it "relevant"
• prevent secondary legislation being used to implement withdrawal agreement until Parliament has approved a mandate for negotiations about the UK's future relationship with the EU.

The second round of votes will take place around 7.15pm, concerning an amendment passed in the Lords making it explicit that the bill must not damage to co-operation between Northern Ireland and Ireland, and must not establish new border arrangements, unless agreed between the UK and Irish governments.

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Leave.EU co-founder Arron Banks is telling the committee about his visits to Russia. He says he has "definitive proof" in his passports that he didn't travel to Moscow in February 2016, as claimed by the Sunday Times from leaked emails.

He invites the committee to look at either of his two passports or his personal diaries and make photocopies if they wish. He says he visited Russia in March 2015 and October 2014.

At the weekend he told the Sunday Times that he had visited Moscow in February 2016 for a "family holiday" with his wife, who is Russian. But he also confusingly said they had visited the world-famous Hermitage museum, which is in St. Petersburg. In front of the committee he attributes the confusion to the fact he was at a cricket match when the paper rang him for comment.

Andy Wigmore says he often jokes with journalists and others who ask where Arron Banks is that "he's in Moscow" which is what happened in the leaked emails.

Arron Banks agrees with Damien Collins' suggestion that emails that say Mr Banks went to Moscow in Feburary 2016 are "just Andy being Andy".

Mr Banks tells the committee he has "no business in Russia and I've done no business deals in Russia".

He admits to holding meetings about a proposal for purchasing and consolidating a number of Russian gold mines but says he took advice from people who knew Russia and the sector who told him it was "fraught with issues" and the deal "dropped away".

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David Davis moves to Amendment 19, which would give Parliamentary approval of negotiations.

He says that this allows "Parliament to dictate the government's course of action in international negotiation". He says that this would weaken the position of negotiators. "This is not practical, not desirable and is not appropriate," he adds.

Labour's Chuka Umunna says that this amendment "reassert[s] Parliamentary sovereignty" which allows the House to approve every aspect of how the UK leaves the EU.

He asks if Mr Davis' amendment "gives his government a passport to take this country out of the European Union" without a deal.

Mr Davis says that the process for leaving the EU without any deal has already started due to the fact that the Article 50 bill was passed by both Houses of Parliament.

Conservative Dominic Grieve says that the bill currently has no provision for what should happen in the event of "no deal".

Mr Davis replies that Parliament should not do anything which "undermines" the negotiating position or imposes delays.

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Theresa May and many of her cabinet ministers have come to support David Davis....

Lord Lisvane introduced this amendment to limit the government's ability to use statutory instruments to amend EU law once it is transferred into UK law.

Statutory instruments are pieces of secondary legislation, used to amend an existing law without introducing a new bill.

They do not require a vote in Parliament.

The government argues that this would slow the implementation of the law to an unacceptable pace.

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The government has listened to Parliament's views throughout the bill's passage, Mr Davis continues.

"Given the scale and speed necessary" changes "could never have been done using primary legislation", he says.

He says that this fundamental premise of changes being made through secondary legislation has been approved by Parliament.

The Lords amendments "increase the risk of judicial review", asking judges to make policy decisions on statutory instruments.

Father of the House Ken Clarke intervenes to say that he is sorry that Mr Davis is "so distrustful of judges".

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There were two Labour rebels (they voted with the government) and two Conservative rebels (they voted against the government) on the programme motion:

Conservatives Anna Soubry and Ken Clarke voted against the programme motion; Labour's Kate Hoey and Frank Field voted with the government.

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The first day of debate has now started and must end by 7:15pm this evening.

The debate begins with the government motion to disagree with Lords amendment 110.

David Davis, Exiting the EU Secretary, says that Parliament has debated over 1,000 non-government amendments to this bill.

"It is worth at this early point remembering that this bill has a simple and clear purpose," which is to convert "40 years of European Union law into UK law", he says.

He calls this an "unprecedented task".

He adds that the Lords have a role to refine legislation, but not to overturn decisions taken by an electorate in a referendum.

Amendment 110 is an "imposition on our procedures and a threat" to the process of handling secondary legislation, he states.

The amendment would "jeopardise our ability to deliver a functioning statute book in time" after the UK leaves the EU, he adds.

He says it is a "sensible approach" to have the exit day on the face of the bill, but to allow this exit day to be amended if necessary.