Fifty years ago Orson Welles's 'Citizen Kane', his first and most astonishing movie - which Welles directed, produced and played the starring role in, all at the age of 25 - received its British premiere. Welles's collaborators, production team, and actors describe its making; Welles himself is featured in BBC interviews from 1960 and 1982; and the real life press baron William Randolph Hearst, upon whom Kane is based, is recalled in rare footage. American film critic Pauline Kael analyses Kane's enduring appeal, and film historian Robert Carringer looks at the scenes that never made it to the screen.