The British House of Commons will vote later on Thursday on the possibility of postponing its exit from the European Union beyond its scheduled date of March 29, after he voted yesterday to reject any exit from the Union without an agreement .

Prime Minister Teresa Mae is preparing to urge parliamentarians to vote again before that time to agree to break out of the bloc they have twice rejected.

Trying to persuade most pro-secessionist deputies to turn down their opposition to the May agreement is key to their plan, in the face of a possible long delay that could mean that Britain would end up with a closer relationship with the EU than expected in the May plan, or that the entire secession would move towards another referendum.

May plans to put its revised exit agreement - twice rejected - to vote again by March 20.

Rally for supporters before the House of Commons before the vote (Getty Images)

The referendum
The British news agency quoted House of Commons Speaker John Burke as saying British MPs would vote on whether the country should hold a second referendum on the exit from the European Union later on Thursday.

Berko chose an amendment calling for a "people's vote" after Teresa Mae put forward a proposal to extend the EU exit process, the agency said.

Anna Supri, who left the Conservatives last month to join an independent group of deputies, was quoted as saying that chances of passing the amendment would depend on whether Jeremy Corbin, leader of the main opposition Labor Party, would support the vote.

A senior British Labor official said he supported a limited extension of the date for leaving the union beyond March 29 to try to reach a compromise solution that could be backed by lawmakers.

"We will put forward an amendment to ensure that the extension is considered by the parliament," said John McDonnell, a spokesman for the Labor Party's financial affairs committee. "It does not have to be a long extension."

Parliamentarians submitted amendments to the government's proposal to postpone Britain's secession from the union, which is due to be voted on today.

One amendment seeks to exclude a new referendum, while the latter supports a second referendum, and calls for a Labor amendment to delay Britain's secession to give parliament time to find an alternative route.

European position
All 27 EU members will have to approve the British demand at their summit next weekend in Brussels.

British Finance Minister Philippe Hammond said the EU could ask for a long delay in Britain's secession if the British government asked for an extension.

For his part, European Council President Donald Tusk said today that European capitals could agree to postpone the departure of Britain for a long time, in a final attempt to persuade the British Prime Minister Teresa May to change their red lines negotiating.

"We will appeal to EU countries to be open to a long extension if the UK finds it necessary to rethink its strategy on the BRICCET and have been able to provide consensus on it," Tusk said in consultations ahead of next week's summit.

As president of the European Council, Tusk will host in Brussels on March 21 the summit where a decision to postpone the date of Britain's departure on March 29 may be requested.

Tusac's pro-longer-term stance, pro-withdrawal MPs concerned about the possibility of London's "restriction" of the union, could encourage further consideration of the agreement proposed by Mai and insist that it is the best formula for leaving.

But Tusk's insistence on "rethinking" reflects an old position of Brussels that a more flexible precast could be possible if May gave up red lines, such as opposing a European union.