Vote yes or Turkey for

opposition hardens against the deal ahead of the December 11 vote.

One minister referred to the proposal as “the Turkey deal for Christmas” because it mirrors Turkey’s relationship with the EU – stuck in its customs union and unable to make other trade deals without agreement from Brussels.

Mrs May yesterday made it clear G20 summit leaders in Argentina were keen to do free trade deals.

She said: “That this deal sets us on a path for a brighter future has been affirmed by the discussions I have had in the past two days.

“Friends and partners were making it clear they are keen to sign and implement ambitious free trade agreements as soon as possible.”

Mrs May also insisted her deal would allow Britain to join the Comprehensive and Progressive Agreement for Trans-Pacific Partnership and plans for a common rule book