A GROUNDBREAKING legal bid to give the UK Parliament the right to revoke Article 50 has taken a dramatic step forward after European judges agreed to fast-track the case.

The European Court of Justice said it will consider next month whether Britain can unilaterally cancel Brexit.

Dr Tobias Lock, one of the nation’s leading experts in EU law, previously told The Herald the case could be decided by Christmas and was likely to succeed.

It comes as the Irish Government urged Theresa May to bring forward her proposals to break the deadlock in the Brexit talks over the Northern Ireland border.

Mrs May has rejected the EU’s plans for a “backstop” to ensure there is no return to a hard border between Northern Ireland and the Republic, but has yet to provide details of a promised alternative.

The landmark legal bid marks a rare show of co-operation between Labour, Green and SNP politicians and involves MEPs David Martin, Catherine Stihler and Alyn Smith, MP Joanna Cherry and MSPs Andy Wightman and Ross Greer.

It comes after Scotland's highest court announced it would refer the question on to Luxembourg, and requested it be fast-tracked due to the “urgency of the issue”. The UK is currently due to leave the EU on March 29.

The ECJ confirmed it has "granted the fast-track procedure on the request for a preliminary ruling from a Scottish court on the reversibility of Article 50".

Jolyon Maugham QC, one of the key figures behind the bid, said a hearing would now take place on November 27. He said: "This is a case vital in our national interest.”

If successful, it would raise the prospect of MPs being able to cancel Brexit without requiring the assent of the other 27 EU members, and allow the UK Parliament the right to withdraw Article 50 – even if the UK Government itself still wanted to press ahead.