The 48-hour week and paid holidays are under threat in a plot by Brexit-backing Tories to axe the EU’s Working Time Directive.

Over the weekend reports suggested Brexiteers in the cabinet will demand the scrapping of the vital protections in order to agree a phase one deal.

Labour’s Wes Streeting said: “Today has underlined how weak Theresa May really is. She is at the mercy of the Brextremists in her own party.

An economists’ study says Brexit is already costing Britain £350 million a week in lack of growth, investment and output.

Remainers were quick to point out the figure bore a remarking resemblance to the figure that certain pro-Brexit campaigners suggested would be available for the NHS after the UK’s departure.