Earlier, the House of Commons Speaker, John Bercow, repeated his warning that another vote cannot be held again on Theresa May's Brexit deal unless it "meets the test of change".

Following the comments, Downing Street said that since the last vote, EU leaders had approved the reassurances over the temporary nature of the Irish backstop (which had been agreed between Mrs May and the EU Commission).

The PM's official spokesman also said that the UK's departure date - which had been planned for this Friday - had also changed.

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It is now Labour MP Dame Margaret Beckett's turn to address the Commons.

The former foreign secretary makes the case for a referendum on any deal that is passed by Parliament.

While the process MPs are currently going through "is a lot better than carrying on as we are", she says it is "too little and too late" and the options being discussed are "substantially different" to what the public were told were on offer during the 2016 referendum.

"Today's proposals mean we stand to lose our voice, our vote and our veto," she says.

"We weren’t forfeiting sovereignty with the EU, we were sharing it."

The prime minister's deal surrenders the UK's sovereignty, Dame Margaret notes, adding: "We are sacrificing sovereignty for the sake of saying we are no longer members of the EU."

"Whatever the outcome of this process, the people should choose if on the terms now on offer they still wish to proceed - they should have the final decision on this."

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Conservative MP David Jones says Speaker John Bercow is "actually quite right" to make clear that he will not accept a third vote on Mrs May's deal unless it has substantially changed.

The former Brexit minister, who is against the PM's deal, says Mr Bercow is upholding precedent in this regard but goes on to accuse the Speaker of double standards.

"Frankly, what we're seeing this afternoon breaks every precedent you can imagine. What we've got today is totally unprecedented.

"So it appears to me that the Speaker is entirely happy to have this series of indicative votes but he's not prepared for the government, on the other hand, to have its own vote back."

The Speaker, he adds, "appears to be operating without any consistency at all".

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As you would expect, the Brexit Secretary argues that none of the options being touted by MPs is as workable or beneficial as the agreement on the table.

"What we see from the amendments is a range of sub-optimal solutions which either don't deliver on the referendum result or do so in the way that doesn't deliver the benefits of the prime minister's deal," Mr Barclay says.

"The deal remains the best way to deliver on the referendum."

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Brexit Secretary Stephen Barclay is now responding to the motions put forward by MPs but he also has an announcement of his own to make.

He says it remains a "priority" for the government to gain Commons approval of its Brexit deal this week.

In order to maximise its ability to do so, he says ministers will be tabling a motion to allow the Commons to sit this Friday.

He says it is "better to have it and not need it, than to need it and not have it".

Why is this so important? Under the terms of the agreement reached with the EU last week to extend the Brexit process, the withdrawal agreement would have to be passed by the end of Friday to guarantee the UK will leave on 22 May.

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The SNP's Joanna Cherry speaks in favour of amendment L, which states that should MPs have failed to approve the withdrawal agreement by the day before the day of exit, the government must revoke Article 50 and stop the Brexit process.

She tells MPs that her amendment is the only way to ensure a no-deal Brexit could not happen.

She says "it ought to be the representatives of the people who decide between revoke and no deal, not the prime minister of a minority government".

Speaker John Bercow announces none of the MPs behind the eight motions he selected earlier have told him they want to withdraw them.

This means all eight options will be voted on at 19.00 GMT.

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Ken Clarke says the constitutional arguments advanced by ministers against giving MPs control over the parliamentary agenda are "absurd" and a "piffling irrelevance".

The former Conservative chancellor, the longest-serving MP in the House, says he hopes the votes later will allow MPs to rally round a course of action with a cross-party consensus that can be "sustained" in future negotiations with the EU.

He says he will vote for "several" options, mentioning the proposal to revoke Article 50, the so-called Common Market 2.0, and his own amendment to put the objective of forming a customs union into law.

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Shadow Brexit secretary Sir Keir Starmer tells MPs that Labour will be whipping its MPs to support amendments K, J and M.

Amendment K negotiates changes to the withdrawal agreement and the political declaration to secure Labour’s position, and pass these objectives into law.

Amendment J enshrines the objective to form a customs union into law.

Amendment M states that the government cannot implement or ratify the withdrawal agreement and the political declaration unless and until they have been approved in a referendum.

On amendment D - the Common Market 2.0 option - he says it is not Labour's "preferred option" but adds that it would "protect jobs" and that he recommends Labour MPs should vote for it.

The Archbishop of Canterbury has urged the public to pray for MPs to come to a "decision that has widespread support and for a process that brings national agreement".

The Most Rev Justin Welby tweeted that it was easy to tell politicians "how badly they are doing" - but that they "deserve respect".

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It is now the turn of Conservative Nick Boles, who makes a passionate speech in favour of his Common Market 2.0 motion.

The MP, who recently quit his local Conservative party amid a row over his Brexit views, suggests he has sacrificed his future career in Parliament to argue for a form of Brexit which is most in the national interest.

He tells MPs that "in years to come the question that our children and grandchildren will ask us is this: In that historic week when Parliament took charge of this nation's destiny, what did you do?"

"Did you stand up and lead or did you hang back in your party trench waiting to be told what to do?"

Conservative MPs will be given a free vote in the series of indicative votes taking place later in Parliament, meaning they will be able to support or reject any proposal without pressure from party whips.

However, Cabinet ministers will be abstaining - meaning their votes won't be recorded.

The BBC's chief political correspondent Vicki Young says this has caused anger among many Tory MPs.

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Labour's Stephen Kinnock is now speaking in support of motion D, formally known as Common Market 2.0.

It proposes that the UK joins the European Economic Area (EEA) through the European Free Trade Association and negotiates a temporary customs union until alternative arrangements can be found.

Mr Kinnock argues this would be "the fastest route to Brexit" and "delivers on what the majority of the British public want".

Brexit: What is Common Market 2.0?

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Conservative MP John Baron, whose selected motion suggests the UK should leave with no deal on 12 April, says warnings about such an outcome are "scare stories".

"This is a repeat of 2016. Those scare stories were wrong then, they are wrong now".

"Let's have a note of optimism about the future of this country."