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Eighteen months ago, Venezuela seemed to be on the brink of political upheaval. The leader of the National Assembly declared himself president and 50 countries offered him official recognition, but socialist rule in Venezuela has not been toppled. Nicolas Maduro is still in the presidential palace overseeing a country deep in economic and healthcare crisis.

Stephen Sackur speaks to Vanessa Neumann, London envoy of the would-be president Juan Guaido. Did the Venezuelan opposition blow their chance?