Tory Remain-backing MPs are drawing up a blueprint to stop a No Deal Brexit which could include sending the Queen to Brussels to seek a further delay to Britain's departure from the EU.
Europhile MPs are worried that if and when Boris Johnson becomes prime minister next week he could try to ignore a future vote in the House of Commons ruling out a disorderly divorce.
Senior Tories who are vehemently against a bad break from the bloc have reportedly discussed a plan to ask the Queen to intervene in such circumstances.
Such a move would be unprecedented and would likely spark a constitutional crisis, potentially setting Buckingham Palace against the new prime minister.
It is thought the MPs could seek to use an arcane parliamentary procedure called a humble address to urge the monarch to get involved.
The address, which MPs would be asked to vote on, would state that if Mr Johnson was to try to ignore the expressed will of parliament against No Deal then the Queen would be asked to step in.
She would then, as head of state, attend the next suitable EU summit to ask European leaders to grant the UK a further Brexit delay beyond the current October 31 deadline.
The Queen could be asked to intervene in Brexit to stop a No Deal divorce under plans being discussed by Tory Remainer MPs
MPs fear that Boris Johnson, pictured this morning in central London, could ignore a future vote in the Commons against a No Deal Brexit
No monarch has ever represented their country at an EU leaders' summit but it is thought the bloc's current rules would allow such a move, according to the BBC's Newsnight programme which first reported the plans.
Remainer MPs believe that John Bercow, the Commons Speaker, will give them opportunities in the run up to the Halloween deadline to vote against No Deal.
However, the UK's current departure is set out in domestic law which means the only way to prevent a disorderly split will be for MPs to find some way of passing their own legislation.
MPs fear that anything short of new laws changing the Brexit date could simply be ignored by Mr Johnson who has vowed to take Britain our of the EU by October 31 'do or die' and with or without a deal.
They are also afraid that Mr Johnson could defy the will of the Commons by alienating the EU during Brexit talks to the point at which European leaders refuse to grant a further extension.
It is thought the Queen could then be tasked with acting as a peacemaker.
One Tory MP involved in the plot to stop No Deal told the BBC: 'The problem is, what if Boris is so aggressive to the EU that Macron leads a charge to say just let the UK go? So even if Parliament votes to block no deal it could still happen.
"One option is a humble address to Her Majesty. You would ask humbly that Her Majesty requests an extension to Article 50.'
It came as it emerged that David Gauke, Philip Hammond and Rory Stewart are all reportedly planning to resign just hours before Mr Johnson is expected to move into Number 10 next week to deny him the chance to sack them.
The trio of Remain-supporting Cabinet ministers are believed to be preparing to quit after Theresa May holds her final prime minister’s questions in the House of Commons on Wednesday.
Meanwhile, it is thought they could be joined by more than a dozen junior ministers who believe they will be on the way out of the government any way once Mr Johnson takes office.
Philip Hammond, pictured yesterday at a G7 meeting in Paris, is believed to be preparing to quit immediately before Mr Johnson becomes PM
Mrs May will go to Buckingham Palace after PMQs to see the Queen to formally resign before the winner of the Tory leadership contest goes to see the monarch to ask permission to form the next government.
But by the time Mr Johnson, the overwhelming favourite to be the next PM, arrives at Number 10 his premiership could already be facing its first crisis.
The former foreign secretary will reportedly spend the weekend finalising his plans for a ministerial shake up.
However, a mass resignation by ministers opposed to his pledge to keep No Deal as a Brexit option will hardly paint the picture of stability which the new PM will want to cultivate.
The claims came after Remain-backing MPs led by Mr Hammond inflicted a damaging defeat on the government yesterday.
Rebel MPs successfully agreed an amendment designed to stop Mr Johnson suspending parliament to force through a disorderly Brexit.