Yanis Varoufakis, the former Greek finance minister, called for Britain to "fight together" and remain in the European Union, in an interview with Business Insider recently. "As long as you are part of a single market you have ceded your sovereignty," he told us. "The European Union is disintegrating, its disintegration will create terrible circumstances of deflation throughout Europe [and] Britain will not be able to escape the effects of this."

Produced by Joe Daunt. Special thanks to Eames Yates.