Prime Minister Boris Johnson said on Friday it was now time to prepare for a no-trade deal Brexit in 10 weeks as the European Union had refused to negotiate seriously, adding that unless Brussels changed course there would be no agreement.

A tumultuous “no deal” finale to the United Kingdom’s five-year Brexit crisis would sow chaos through the delicate supply chains that stretch across Britain, the EU and beyond – just as the economic hit from the coronavirus pandemic worsens.