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Sam Lowe, a research fellow at the Centre for European Reform, said the move marked a U-turn from previous British policy to renegotiate UK-only versions of the deals.“It is not great for our credibility as a reliable negotiation partner,” he tweeted.

Rees-Mogg asked Steve Baker to “confirm that he heard from Charles Grant of the pro-EU Centre for European Reform that officials in the Treasury have deliberately developed a model to show that all options other than staying in the customs union are bad, and that officials intend to use the model to influence policy?” Baker agreed with Rees-Mogg, although their effort to renew their attack on Treasury officials backfired when a recording emerged to show that supposed source Grant had not said the Treasury had developed such a model, instead making the more basic claim that the Treasury was determined to stay in the customs union.

“No government is okay with having a border that’s just open when they’ve got no arrangement with the people on the other side,” said Sam Lowe, a trade expert at the Centre for European Reform.

Mrs May told reporters last week that the transition deal would be “a period of practical implementation” and denied reports that Mr Robbins had told EU negotiators that Britain wanted it to stretch for three years. “We are not talking about something that goes on and on,” she said. But veteran Europe watchers note that in Brussels, temporary arrangements tend to last longer than first anticipated. “I think three to five years,” says Charles Grant, director of the Centre for European Reform.

Sam Lowe, a trade expert at the Centre for European Reform, said that Mrs May’s call for British rules to stay “substantially” similar to those of the EU made a US deal harder. “Theresa May’s speech suggests that a US-UK deal is not a priority for her. She wants to stay closely aligned with the EU and it will be for future parliaments to diverge.”

Rees-Mogg stood by his claim that in drawing up its Brexit plans, the Treasury was trying to influence the argument. He also said that Charles Grant, head of the Centre for European Reform, had been given improper briefings. “He is getting private briefings from the Treasury against government policy,” he told BBC Radio 4’s Today. “This is very serious. It is not for officials to invent policy. With the referendum and with the EU, the Treasury has gone back to making forecasts. It was politically advantageous in the past. It is the same for them now. I do think they are fiddling the figures.”Grant said it was perfectly normal for officials to talk to think-tanks. “The Treasury cares about economics so it is naturally pushing for the sorts of Brexit that minimise the economic damage,” he said.

In the Commons on Thursday, Mr Rees-Mogg asked Brexit minister Steve Baker to confirm whether he had heard that officials were deliberately trying to influence policy in favour of staying in the EU customs union.
He attributed the remarks to Charles Grant, the head of the Centre for European Reform.
On Friday, Mr Baker apologised to MPs for saying Mr Rees-Mogg's account of the remarks was "essentially correct".
Mr Grant had denied making them and an audio recording emerged where he did not say what was attributed to him.