In 2020, after three and a half years of bitter negotiations, Britain left the European Union. For some it was a day of freedom, for others a tragedy which would leave Britain isolated and poorer. Vote Brexit, the Remain campaign warned us, and it would be an act of self-harm. The economy would collapse, sending prices and unemployment soaring. Meanwhile, in contrast to xenophobic, inward-looking Britain, the EU would soar ahead without us.