BRITAIN would be locked “indefinitely” into the EU’s customs union if Theresa May’s Brexit deal proposal was passed, leaked documents of the attorney-general’s legal advice claim.
The details have been suppressed with senior ministers saying the Prime Minister has refused to publish the advice because it highlights that the UK could end up being trapped in a “backstop” arrangement with Brussels.
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claims it has seen the letter Geoffrey Cox wrote to cabinet ministers last month.
It says: “The protocol would endure indefinitely.”
The country’s top legal officer added that the only way the UK could get out of the backstop would be to sign a new trade agreement, which could take years.
But he said Britain would only stay trapped if those talks collapsed.
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The letter was said to be so sensitive that ministers were given numbered copies to read which they were not allowed to take from the room afterwards.
Labour said it is ready to combine with other opposition parties to start proceedings for contempt of Parliament unless the legal opinion of Attorney General Geoffrey Cox is published in full.
The DUP - which props up the Conservative government in the Commons - was said to be ready to sign a joint letter with other parties to Speaker John Bercow on Monday unless ministers back down.
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It potentially represents another hurdle for Theresa May to overcome as she struggles to win backing for her deal in the crucial commons vote on December 11.