As part of the BBC's A Richer World season, Hardtalk speaks to one of Britain's wealthiest men, John Caudwell. He made his fortune out of mobile phones and now divides his time between backing new businesses and philanthropy. What are the ingredients for a healthy capitalist society? Do the world's richest individuals owe anything to the societies within which they flourish? And is the notion of 'giving back' a choice or a moral obligation?