How much of the Brexit talks is just posturing; them saying they can't be flexible when they can. Us saying we might walk when we wouldn't. What's the best way to deal with the EU? We put these questions to Greece's former finance minister, Yanis Varoufakis and Poland's former foreign minister, Radoslaw Sikorski. (Image: Theresa May and Jean-Claude Juncker, credit: Getty Images)