What keeps a nation together? For political scientist Benedict Anderson, it was the idea of the 'imagined community'. Although people from different backgrounds in a country might not know one another, they could imagine themselves as part of the same larger story.

Peter Pomerantsev looks at how we can survive as a society when the idea of the 'imagined community' is under strain. Is it too late to find any commonality? Or are there other ways of imagining the future of the nation?

Producer Ant Adeane