James Landale, the BBC's deputy political editor, examines how and why Euroscepticism has become an increasingly powerful force in UK politics.
He explores recent political developments, including changes within the Conservative party and the rise of UKIP. He examines the role played by business and the media. He considers the impact of the EU's own policies. And he reflects on underlying global trends.
Interviewees include Boris Johnson, Nigel Farage, Peter Mandelson and other politicians and commentators.
Producer: Martin Rosenbaum.