Britain is about to become self-sufficient in Energy. But how long will the ' fat years ' last? And how should we prepare for the ' lean years ' that will follow when the oil and gas in the North Sea run out? Ian Smart, Director of Studies at Chatham House, explores the options with Sir Derek Ezra , Chairman of the National Coal Board, Sir John Hill , Chairman of the Atomic Energy Authority, Peter King of the School of Fuel Management, Dr Walter Marshall , Chief Scientist at the Department of Energy, Peter Odell of Erasmus University, Rotterdam, Walter Patterson of Friends of the Earth, Francis Tombs , Chairman designate of the Electricity Council, and Harry Warman of the British National Oil Corporation. Producer ANNE SLOMAN