The SNP's Europe spokesman, Stephen Gethins, says Parliament is facing a "tragedy of epic proportions" and there are no winners.

The North East Fife MP says the indicative vote process is "all about us trying to make something less, rather than better".

He adds: "We are focused on least worst options and damage limitations. We shouldn't be doing that and it is time to put this Brexit nightmare behind us".

Europe, says Mr Gethins, was a force for good that had made the UK wealthier, safer, greener and fairer.

He urged MPs to vote for SNP MP Joanna Cherry's motion, seeking an extension to the Brexit process - and potentially a revocation of Article 50 - saying it was a "responsible proposal".

Stephen Barclay was earlier asked if he was among 170 Conservative MPs who signed a letter to Mrs May seeking to keep no-deal on the table.

He replied: "I have not signed any letter of the sort."

He added: "I have the opportunity to meet with the prime minister most days and if I have a point to raise with her obviously I would do so."

Mr Barclay also noted a withdrawal agreement is required as part of the plans outlined in the customs union, common market and second referendum motions.

Huw Merriman, Tory MP and aide to the Chancellor, said he'll support the motion on holding another public vote on any Brexit deal, but said it would be with a "great degree of self-loathing".

He told MPs he's backing the proposal tabled by Labour's Peter Kyle and Phil Wilson because "Parliament is unable to reach a majority and make a decision".

After the PM's deal failed again, he said he had been left with two choices, either "find myself in meaningful vote 3,029", or "look ahead and try and find a solution which will deliver what I want", which is to "honour the vote of 2016".

Following straight after Sir Keir is Conservative MP Ed Vaizey.

He tells the Commons that he'll vote for the customs union amendment and Common Market 2.0.

He added his concern that "too many of our colleagues have decided they are the self-appointed interpreters of Brexit".

Labour will support customs union motion and Common Market 2.0 says Shadow Brexit secretary, Sir Keir Starmer.

Support for a softer option appears to be gaining ground in the Commons as MPs debate the four alternative proposals to the PM's Brexit deal.

Labour and the SNP now back a plan which would see the UK leave the EU - but stay in the customs union and the single market.

At least four cabinet ministers have spoken out against leaving under a softer option.

And Emily Thornberry, shadow foreign secretary, said the party would support other options, including staying in a single market - this means accepting freedom of movement.

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Conservative Dominic Grieve is the next MP to speak.

He was in the news over the weekend after he lost a vote of confidence of his constituency party in Beaconsfield.

He tells MPs it would be "very odd thing" for the UK to leave the EU without the public having another direct say.

That's because, he tells MPs, the current deal on offer and some of the other options being touted bear little resemblance to what the Leave campaign promised voters back in 2016.

He insists he would do anything to stop the "catastrophe" of a no-deal exit.

The government has promised to reimburse election officials for the cost of preparing for the European elections, if they go ahead.

Cabinet Office minister David Lidington, in a letter to returning officers, said it was no longer possible to guarantee that the UK would not be taking part in the polls, due to happen across Europe on 23-26 May.

He said ministers would shortly be issuing a statutory instrument in Parliament to confirm the decision.

The move will be seen as further evidence that the government is preparing the ground for a possible longer delay to Brexit.

The decision is likely to increase the pressure on Tory Brexiteers to support the prime minister's deal or risk having to fight the European elections.

Mr Lidington said: "Following Friday's vote in the House of Commons the opportunity to guarantee that the UK would not participate in the European Parliament elections has been removed."

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Unsurprisingly, there have been a few gags from MPs following that climate change protest.

The SNP's Joanna Cherry says her plan to give MPs a vote on a no-deal exit and, if it is rejected, to revoke Article 50 is designed to "ensure the prime minister does not go naked into the conference chamber".

There are a few giggles from the SNP benches as Ms Cherry insists the UK cannot allow a no-deal exit to "happen by accident" in just under two weeks' time.

Image source, EPA handout

Police say they have arrested 12 climate change protesters for outraging public decency after staging a semi-naked protest in the House of Commons public gallery.

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During his speech, Nick Boles fielded several questions from MPs concerned about what his Common Market 2.0 plan would mean for freedom of movement.

In short, he said European nationals would continue to have the right to live and work in the UK as now - but the UK would also have the legal right to request what is known as a derogation and impose immigration controls in certain parts of the country if there was deemed to be an emergency.

This sounds similar to the "handbrake" idea that David Cameron was reported to have sought but failed to get during his 2016 re-negotiation.

Mr Boles says Common Market 2.0 is the "leave option that does the least damage to the British economy".

While he does not back another referendum, he says he respects the passion of its advocates and urges them to back his proposal, saying they will have the opportunity to continue to make the case for another public poll as legislation implementing Brexit goes through the Commons.

This is "the start, not the end of the conversation," he insists.

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Tory MP Andrew Mitchell says he would be prepared to support a customs union because it "delivers virtually all of Brexit".

The former chief whip - who supported remain in the referendum - says he believes a customs union is the "third best option" behind Theresa May's deal and no deal, although he acknowledged it would mean the UK couldn't negotiate individual trade deals with other countries.

He says he hopes the indicative vote process will give Parliament something to build on - adding that the result cannot be ignored by the prime minister.

“We have got to bring this to a conclusion. We have got to move on as a country," he says.

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Back to Labour MP Peter Kyle's motion.

He rejected suggestions that holding another referendum, which could result in the UK remaining in the EU, is an "elitist stitch-up".

Quite the contrary, he argues.

Leaving the EU without a deal but not giving the public a say about such an upheaval would be the ultimate betrayal, he suggests.

He tries to reassure those who oppose the PM's deal about his proposal, telling them that they would not be endorsing the withdrawal agreement but effectively withholding their consent until the public has spoken.

This, he concludes, is a way of "ending the Brexit nightmare".

More on that climate change protest, pictures of which doing the rounds on Twitter leave little to the imagination.

A couple of those involved super-glued themselves to the glass screen in the public gallery.

According to the BBC's Andrew Sinclair, the last one was removed "horizontally".

Tory MP Nigel Evans has paid tribute to the police and security staff, saying the protest had been a "distraction but not a disruption".

John Bercow concurred, commending the staff who protect MPs.