THERESA May is facing a Valentine’s Day humiliation in the Commons this evening as Tory Brexiteers are poised to help defeat a UK Government motion on Britain’s EU withdrawal.

Such a move would further hamper the Prime Minister’s efforts to get the EU27 to agree a revised deal as the clock runs down to exit day on March 29.

As MPs prepared for the latest Commons showdown, Nicola Sturgeon hit out at the “frankly incredible” consequences of a no-deal outcome, including shortages of food and medicine.

In an interview with ITV’s Peston programme, following a meeting of the Scottish Government’s Resilience Committee, the First Minister insisted a no-deal Brexit was not inevitable.

“The Government at UK level should take that prospect off the table, it should rule out no-deal and its failure to do so with every day that passes right now becomes increasingly reckless and negligent,” she declared.

In the second next-steps Commons debate and vote today, the Government has put forward a seemingly innocuous motion, reiterating Parliament’s support for the “approach to leaving the EU expressed by this House on January 29”.

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Last month’s votes not only saw an amendment passed that called for the backstop to be replaced by “alternative arrangements,” which the Government championed, but also one rejecting the UK leaving the EU without a deal.

On Tuesday night, Olly Robbins, the UK’s chief Brexit official, was reportedly overheard in a Brussels bar, saying Mrs May’s strategy was to offer a last-minute Commons vote in March for either her revised deal or a lengthy delay to Brexit.

During PMQs, she brushed aside the claim, saying people should not rely “on what someone said to someone else as overheard by someone else in a bar,” again emphasising the Article 50 timescale ran out on March 29.

No 10 sought to disabuse people of the notion Mrs May was surreptitiously ruling out a no-deal outcome.

Her spokesman declared: “If you’re asking me a question: does no-deal remain on the table? The answer is yes.”

But members of the Conservatives’ anti-EU European Research Council made clear they could not support the “clumsily-worded” Government motion.

Mark Francois, its vice-chairman, said: “We cannot vote for this as it is currently configured because it rules out no-deal and removes our negotiating leverage in Brussels…It is madness.”

Several amendments have been tabled. John Bercow, the Speaker, will decide which ones will be debated and voted on this evening.

Labour has tabled a proposal, which would require the Government to either put its deal to a vote by February 27 or allow Parliament to take control of the process.

Its Shadow Brexit Secretary, Keir Starmer - who on Wednesday had "frank and serious" talks with David Lidington, the PM’s de facto deputy - said Labour was committed to preventing Mrs May from pursuing a "reckless" policy of running down the clock so MPs were faced with a choice between her deal or no-deal with just days to go to exit day.

The SNP tabled an amendment requiring the UK Government to begin immediate negotiations with the European Council to extend Article 50 by no less than three months.

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Ian Blackford, the party leader at Westminster, said: “The UK Government must stop running down the clock and put the brakes on Brexit before we are dragged off the cliff-edge with catastrophic damage to jobs, living standards and the economy.”

Other amendments include one tabled by Ken Clarke, the former Tory Chancellor, calling for votes on various Brexit options and one from the SNP’s Angus MacNeil to scrap the Article 50 process altogether.

While today’s vote will be an important indicator of Parliament’s mood, any successful amendment will not be legally binding on the Government.

In contrast, a promised next-steps vote on February 27 is being described as “High Noon” as it is when a new amendment, drawn up by Labour’s Yvette Cooper, will be tabled, stipulating if there were no deal by mid-March, MPs would either vote to agree a no-deal Brexit or to require the PM to seek an extension of Article 50.

A similar move was defeated in January but the new version appears to be gaining more support and could even be backed by Cabinet ministers, who would resign to do so. One Whitehall insider said: “It looks like it could get through this time.”