Britain and the European Union on Wednesday agreed to hold last-ditch talks aimed at securing a Brexit deal with just days left to thrash out an agreement, as the two sides accuse each other of failing to compromise.

Brexit Secretary Steve Barclay will meet his EU counterpart Michel Barnier in Brussels in an attempt to break the impasse before an October 17-18 summit.

"We've put forward serious proposals and have been willing to be flexible. Now it's time for the EU to do the same," Barclay tweeted.

The meeting was put back 24 hours until Friday morning after London said Prime Minister Boris Johnson would meet his Irish counterpart Leo Varadkar on Thursday.

Johnson is obliged by law to seek an extension to Britain's Brexit date if he fails to agree a deal with the EU Johnson is obliged by law to seek an extension to Britain's Brexit date if he fails to agree a deal with the EU Photo: AFP / Ben STANSALL

Barnier played down hopes of a breakthrough before EU leaders meet, even as he promised to work around the clock to the deadline.

He said the EU could not accept Britain's proposals as they stand, arguing they would undermine peace and weaken the European single market.

"As I speak to you now, we're not on the point of envisioning and finding a deal," he told the European Parliament.on

Britain is due to leave the EU on October 31, more than three years after a landmark referendum that has dominated domestic politics and divided the nation.

Johnson has promised to take the country out of the bloc after nearly five decades of integration -- with or without a withdrawal agreement.

Brexit has divided Britain and dominated domestic politics Brexit has divided Britain and dominated domestic politics Photo: AFP / Kenzo TRIBOUILLARD

Irish talks

On Tuesday, Downing Street sources broke diplomatic protocol by leaking details of a private conversation between Johnson and German Chancellor Angela Merkel.

Merkel was alleged to have said a deal was "overwhelmingly unlikely" without further UK compromise on its plans to keep open the border between EU member Ireland and the British province of Northern Ireland.

Berlin declined to give details of the call but an irate European Council chief Donald Tusk accused Johnson of playing a "stupid blame game" and jeopardising the future of both Britain and the EU.

Johnson's meeting with Varadkar at an unspecified location in northwest England comes with few signs Dublin is prepared to move on its position about border arrangements.

Finding a way to keep the frontier between north and south open without Northern Ireland being tied to EU trade rules has long been the main sticking point in talks.

Results of a poll in six European countries on perceptions of Brexit. Results of a poll in six European countries on perceptions of Brexit. Photo: AFP / Alain BOMMENEL

The prospect of a hard border has raised fears that it could reignite unrest between pro-Irish republicans and unionists that killed thousands over three decades from the late 1960s.

Ireland on Tuesday announced it had set aside 1.2 billion euros ($1.3 billion) in its 2020 budget as a contingency for no-deal, which has been seen as a sign of its pessimism about the talks.

Varadkar said it would be "very difficult to secure an agreement by next week".

Barnier said Britain's proposals "would replace a practical, operational and legal solution with a solution that is hypothetical and provisional".

Rare Saturday parliament

Anti-Brexit campaigners in Britain believe Johnson, who took over as PM from Theresa May in July, is using the EU talks to play a political game to cement his credentials as a eurosceptic leader.

Speculation is rife that a snap general is on the cards, where he could exploit apparent EU intransigence over negotiations on the campaign trail.

Despite the law demanding he ask the EU to delay Brexit if he does not get a deal, he has previously said he would "rather die in a ditch".

Amid speculation that he could use a legal loophole to fulfil his pledge to "get Brexit done", campaigners have gone to court to try to force him to obey the law.

But judges at Scotland's highest civil court this week made two rulings stating that Johnson's assurances to the court that he would comply were enough.

The law states that any Brexit delay must be requested by October 19 -- the day after next week's EU summit -- and the government has called for parliament to sit that day.

It will be the first Saturday sitting in 37 years and only the fifth since 1939.

The last weekend session was on April 3, 1982 after the Argentinian invasion of the Falkland Islands, a British overseas territory.

Other Saturday sittings were called for the outbreak of World War II and the Suez Crisis of 1956.

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