For nearly 50 years everybody who was anybody in the British theatre passed before the lens of Angus McBean - Gielgud, Olivier, Thorndike, Coward ... He was known as the photographer who resolutely flattered his sitters. Tonight, after a ten-year absence. McBean demonstrates his skill with his old friend Sir Ralph Richardson. He discusses for the first time his astonishing surreal pictures of the 30s and 40s.