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As a criminal enquiry opens into bank rate-rigging, Lesley Curwen and her guests debate whether banks have lost sight of their true purpose, and whether the solution involves cutting bonuses and addressing conflicts of interest.

This week's guests are Dan Ariely, Professor of Psychology and Behavioural Economics at Duke University, author Clark McGinn who worked for 20 years at Royal Bank of Scotland, and Henrietta Royle, an ex-banker and Chief Executive of consultancy Fanshawe Haldin.

Plus, comedian Colm O'Regan finds expialidocious lessons for today's bankers from the tale of Mary Poppins.