Sir David Tweedie is the most powerful accountant in the world. Don't yawn: as chairman of the International Accounting Standards Board, he is the man who tries to keep global capitalism honest in the face of bubbles, corporate lies, corruption, and huge changes in what companies do and the way they value their businesses. Peter Day hears from Sir David about his ceaseless quest for clarity in a world of often baffling facts and figures. nProducer: Sandra Kanthal nEditor: Stephen Chilcott
