Sony hack: North Korea threatens US as row deepens

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But could Sony have done more to beef up its cyber security? We talk to Ken Cukier, big data expert at The Economist newspaper. Also in the programme, a Spanish judge has ordered the king's sister, Princess Cristina, to be tried along with her husband on charges of tax fraud. Plus, the plight of migrant Nepalese workers in Qatar building hotels and stadiums for the 2022 World Cup. We have a special report from Nepal. And our regular commentator, Lucy Kellaway of the Financial Times newspaper on the merits of conscientiousness in the workplace.