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Millions of Brits face going to the Post Office and paying a £5.50 fee to take a day trip to France if there is a no deal Brexit.

An official report today reveals details of a plan to massively ramp up the number of International Driving Permits if the UK fails to reach agreement with the EU.

Currently, Brits need the £5.50 permits to drive in more than 140 countries outside the EU - and about 100,000 are issued per year.

But serious backup plans are now under way to issue them to drivers who go to the EU too, the National Audit Office (NAO) said.

This would hugely increase the number of IDPs issued per year, from 100,000 to an estimated 7million.

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The number of Post Offices that issue the permits would also have to increase massively, from the current 89 to 4,500 across the country.

Today the NAO issued a blunt warning suggesting the plan may not be ready by Brexit Day in March 2019.

"As yet, there is no business case and no detailed delivery plans," the NAO declared.

IDPs only last 12 months, then have to be renewed.

Currently applicants have to go in person to a Post Office branch with their full driving licence, a passport-sized photo and another proof of ID like a passport.

(Image: Getty Images)

The watchdog said the Department for Transport only "formally notified" the Post Office of contract changes two months ago, and then only in "outline form".

"Since then, the Post Office has been working on its detailed delivery plans for submission to the DVLA and the Department," the NAO said.

The NAO makes clear the rise in IDPs will only happen if there is no agreement to ensure "mutual recognition" of UK and EU driving licences.

But it comes as both the EU and the UK ramp up preparations for a no deal Brexit after a week of Tory civil war and deadlock in Parliament.

(Image: Getty)

Today Brussels is warning the 27 remaining EU states to get ready for a possible no-deal Brexit, with a document expected to warn of long queues at borders and ports, disruption to planes and new restrictions on data transfers.

Meanwhile, the UK government will publish dozens of documents on preparations business need to do for "no deal" over the coming weeks.

Prime Minister Theresa May said last night the 70 or so "technical notices" would set out what is required for citizens and firms if the UK leaves the EU in March next year without a withdrawal agreement.