Leaving the European Union without a divorce deal could increase Britons’ mobile phone roaming charges, upset data sharing and force motorists to get an international license to drive in Europe, the government told the public and businesses on Thursday.

Recent signals from Brussels have buoyed hopes that the United Kingdom and the EU can agree and approve a proper divorce agreement before the UK leaves on March 29, though the sides are still divided on about one fifth of the detail of a deal.

But many business chiefs and investors fear politics could scupper an agreement, thrusting the world’s fifth largest economy into a “no-deal” Brexit that they say would weaken the West, spook financial markets and silt up the arteries of trade.

Britain has stepped up planning for the effects of such a departure and on Thursday published 28 technical notices (Click here ) covering the impact on areas ranging from environmental standards to certification for manufacturers.

A “no-deal” Brexit, the government cautioned, would make life for UK citizens and businesses more complicated, more expensive and more bureaucratic.

British businesses, for example, would have to rush to ensure they could still receive personal data about European customers, while many manufacturers would need to have their exported products retested by EU safety regulators.

Brexit minister Dominic Raab said a no-deal Brexit was unlikely, but that the United Kingdom would manage the challenges and eventually flourish.

Still, the notices offer a glimpse of just how complicated the government believes the divorce could become after 46 years inside the European club.

The notices, often a few pages per sector, also covered the implications for space programs, trading in drug precursors and reporting CO2 emissions for new cars.

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