Tensions in the conservative party increased this weekend. (Image: GETTY)

Fears that Ms. May now plans to sell the Brexit increased after the Sunday Express was informed that its chief of staff, Gavin Barwell, is scheduled to meet with parliamentarians Remainer Tory who are pushing for a second referendum to undo the Brexit.

Mr. Barwell's meeting, scheduled for Wednesday, will include former Cabinet Minister Justine Greening and others who participate in the so-called popular vote campaign.

Growing fears about the outcome of the negotiations led Mr. Johnson earlier this week to tell his Brexite colleagues in Parliament that there will be "a stitch" when he urged them to prepare to "resist" an agreement that leaves to Britain as a "colony of the United States."

But a high-level government source has indicated that there are already moves to ensure that a "no agreement" with the EU is the least likely option after a week in which Ms. May has already discussed the extension of the transition period before to leave the EU.

Mocking the Tory backbenchers, the source close to the prime minister said: "What [Brexiteer Tory rebels] You do not realize that a non-agreement is the least likely to happen if you reject an agreement.

"Having another choice, extending Article 50 and other options is much more likely to happen. It is almost certain that there will be no deal. "

Meanwhile, Sunday Express has also learned that relations between members of the pro-Brexit European Research Group of Tory and Downing Street parliamentarians are breaking down.

A senior member of the group revealed that many Brexiteer parliamentarians are now "rejecting" dinner invitations in Downing Street with senior advisers to Ms. May to discuss an agreement with the EU.

The deputy said: "We found in the past that parliamentarians were used for propaganda and now there is nothing to discuss."

The ERG has stated that it is likely that up to 80 parliamentarians will reject an agreement based on Ms. May's Checkers proposal and 40 of them will not be affected by the issue.

Any attempt to extend Article 50 or the Brexit transition and delay period would be insane

Mark Francois

Mark Francois, the vice president of the ERG, said: "I am an old whip, so I know the tricks of the whips, but we are sure that they can only reduce the numbers to 40. That means The ladies can not go through the parliament."

He added: "Any attempt to extend Article 50 or the transition period and the Brexit delay would be nonsensical, they just will not make it."

It is also understood that there are 40 of the 48 letters needed by conservative parliamentarians to generate a vote of confidence in the leader.

But Ms. May's allies made it clear that they believe she is now safe because the Brexiteers did not act before the summer break after Mr. Johnson and former Brexit secretary David Davis resigned.

The main source said: "We are going to fight against them until death, with each passing week we become stronger and they become weaker".

There is also the opinion that once an agreement with the EU is agreed upon, even if the Brexit is not delivered correctly, Tory parliamentarians will be obliged to support it.

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Mr. Johnson urged the Brexiteers to prepare to "resist" an agreement that turns Britain into an "EU colony" (Image: Steve Back / GETTY)

A source in Downing Street said: "When not, if we get an agreement, the dynamics will change completely.

"Then, they will have to explain to their constituents why they are putting their jobs at risk just because of the concept of a clean Brexit. People did not vote for that and they will not be forgiven. "

A cabinet minister and close ally of Ms. May added: "Boris's mistake was not to push a vote of confidence before the summer.

"Then it would have been like the end of Margaret Thatcher on how many deputies voted against her, now if the Prime Minister wins is enough and they have failed."

"It's too late to press that button now."

Already some members of Brexiteer and Remainer Tory have expressed concern that the government will adopt a proposal led by former Interior Minister Amber Rudd and former minister Nick Boles for an option called Norway.

The remnant Tory MP Phillip Lee said: "It would be a disaster. We would have all the disadvantages of being in the EU, but we have no control over the decisions made by us.

"The Brexiteers agree with me on this, but I'm afraid that is what is going to be imposed on all of us."

Another MP attacked Ms. Rudd's support for the option that had to do with personal ambition.

He said: "She (Rudd) sees this as a quick way to return to the cabinet."

There are also hints of divisions between Brex tactics on tactics with some already expressing anger over the fact that Johnson and Jacob Rees-Mogg refused to pull the trigger in a leadership challenge before the summer.

A deputy said: "We are still waiting for the big and the good to give us the go-ahead". I'm afraid they left it too late.

Tory deputy Andrea Jenkyns, who has been collecting letters of no confidence, said some of her colleagues have refused because they "fear that they will lock us up in a three-month leadership competition."

But Shipley's deputy, Philip Davies, said that voters who want conservatives to send Brexit are now losing confidence in the government.

He said: "What worries me is how it is decreasing with our voters and it is decreasing very badly."