Tony Palmer chairs a discussion on the life and legacy of Cecil Rhodes , one of the most controversial figures of the British Empire. His extraordinary career shaped the history of Africa and is the subject of the ambitious BBC1 drama, Rhodes, the first episode of which was broadcast on Sunday evening, and which Night Waves will be reviewing tonight. And acclaimed film-writer David Thomson discusses the subject of his new biography, another ambitious, egotistic and talented figure: Orson Welles. Producer Abigail Appleton