THE Arfon MP Hywel Williams has described the opinion of the European court's most senior advisor on Brexit as a "game changer."

Mr Campos Sanchez-Bordona has confirmed that the UK can revoke Article 50, which would mean it could stay in the EU without other European countries’ agreement.

Mr Williams, who is Plaid Cymru’s Brexit spokesperson, wrote a sworn statement (known as an Affidavit) for the case, working with the lawyers who took the case to the Scottish and European courts.

Today’s publication of the European Court of Justice Advocate General’s opinion is not binding, although the court generally follows advice given.

The opinion also implies that it is possible for Article 50 to be revoked to avoid a ‘No Deal’ scenario. A key procedural barrier to a People’s Vote will also be removed.

Hywel Williams MP said: "This is a game changer. Momentum has swung in favour of the pragmatic pro-European voices on the day debates begin in Parliament on the Prime Minister’s woeful Brexit agreement.

"Of course, we must wait for the final decision of the court, but we have taken a big stride towards stopping the damage being done by Brexit.

"With Article 50 likely to be unilaterally revocable, ‘No Deal’ will soon not be an option. The Prime Minister will be left with two choices - a bad Brexit or no Brexit.

‘Her empty threats will be exposed and the need for a sensible solution to the chaos we have seen over the last two years will come forward.’

"Even the Government admits Brexit will leave people worse off. With the practicalities of a People’s Vote no longer a barrier and the truth about Brexit becoming clearer every day, it is now clear the people must have the final say."