Tonight, as Yasuo Hamanaka comes to trial in Tokyo, Michael Robinson investigates the western brokers who made millions from his speculation on the international copper market. In a tale of market manipulation and unfair pricing on a grand scale, The Copper Ring reveals that there were key players in the events which cost the Sumitomo Corporation £2.8 billion but who have so far avoided censure.

(Note: as Panorama is topical and likely to react to events in the news, its subject matter may change)