Donald Trump is set to offer the UK a “zero tariff” trade pact.

US ambassador Robert “Woody” Johnson said the President wants a “quick deal” to help Brexit Britain.

The offer came as Theresa May‘s 12-point Brexit plan won Cabinet backing.

News of the zero tariff offer will be the icing on the cake for the Prime Minister.

Mr Trump, who is due to visit the UK next week, wants to dramatically increase transatlantic trade between the “special relationship” allies after Britain quits the EU.

“The President thinks it’s time to go,” Mr Johnson, America’s man in London said, adding: “The sky’s the limit.” The offer, which could slash the prices of US imports for British consumers and boost job creation on both sides of the Atlantic, was hailed as a massive vote of confidence in the UK’s future outside the European bloc.

Mr Johnson revealed the White House’s enthusiasm for accelerating talks on UK-US trade in an exclusive interview with the Daily Express ahead of President Trump’s long-awaited first official UK visit.

The US leader is due to meet the Queen at Windsor Castle, hold talks with Mrs May at Chequers and will be welcomed with a black-tie banquet at Blenheim Palace.

Speaking at the new US Embassy complex in south London, Mr Johnson confirmed that “zero tariffs” on all trade between Britain and the UK could be the starting point for negotiations on a post-Brexit deal between the two allies.

“I think it would be bold and why not start off with that premise? “The President will put his full energy behind a quick deal,” he said.

Mr Johnson said that the President instinctively wanted to seize the moment and agree a post-Brexit trade deal with the UK as soon as possible.

The ambassador said: “As an American you want to get on with it and make a deal quickly.

The President thinks it’s time to go.” Mr Johnson was optimistic about Britain’s prospects outside the EU, saying: “The sky’s the limit.

“You’ve got something really special here – the language, the culture, history, legal system, the institutions that are the envy of the world.

When you stand up on your own it will be something to watch.” Brexit campaigners were delighted by the prospect of a zero tariff deal.

Tory MP Nigel Evans said: “This is brilliant news.

It would be the best start for Brexit.” Professor Patrick Minford, the chairman of Economists for Free Trade, said: “A trade deal with the US is really important.

“Our consumers will benefit from barrier-free access, bringing down UK prices, and we too can offer high value goods and services to the US market if barriers come down.

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