Theresa May has been told that she faces another heavy defeat in parliament if she fails to secure concessions from Brussels

Theresa May has pleaded with the EU to hand her an eleventh-hour concession to break the deadlock in Brexit negotiations and allow her to put a revised deal to a vote of MPs tomorrow.

Downing Street has set a deadline of early evening to achieve a breakthrough in the talks despite insistence from the EU that it will not improve its offer on the Irish backstop.

The prime minister’s official spokesman insisted that MPs would still be given a vote tomorrow but did not rule out altering the motion to make it “conditional” on further concessions from Brussels.

He added that if the vote fell through MPs would also get a chance to vote on extending Article 50. Nick Boles, the Conservative former minister, warned