After the British Labour Party suffered a crushing election defeat a year ago, the shell-shocked party took a dramatic turn to the left. New leader Jeremy Corbyn presented himself as the anti-austerity, anti-war antithesis of Tony Blair's new Labour. So, how is the Corbyn formula working? Stephen Sackur talks to Labour stalwart, shadow foreign secretary Hilary Benn and asks, does Labour present a credible alternative to the Cameron government?
