Theresa May could block Philip Hammond from publishing the economic modelling of a no deal Brexit before Parliament is asked to vote on the Prime Minister’s deal with Brussels.

The Chancellor said last week that cross-Whitehall analysis looking at Brexit impacts which was published in January would be “refined” in the run up to the vote as he re-committed to providing MPs with the “appropriate analysis” before they decide.

But Downing Street repeatedly refused to guarantee that MPs will be provided with forecasts of what a disorderly Brexit could mean for the UK before they vote to either accept or reject Mrs May’s agreement.

It came as Mrs May said at the start of a trip to Africa that leaving the EU without a deal would not be the “end of the world” as she appeared to dismiss the Chancellor’s warnings about a no-deal Brexit.

The Prime Minister refused on two occasions to endorse Mr Hammond’s claims that a no-deal Brexit would lead to billions in additional borrowing and a slowing of economic growth by up to 10 per cent over the next 15 years.

Mrs May has long maintained that "no deal is better than a bad deal" and the Government has framed Parliament’s so-called “meaningful vote” as a take it or leave it offer, with the UK crashing out of the EU if MPs vote it down.