I happened to catch Part One of this excellent BBC documentary during the week, though it was on at some ungodly hour on BBC 4. Thanks to the magical power of the Internet, some kind soul has uploaded the whole thing, parts One and Two. Made in 1982, this is an extended interview with Welles covering all aspects of his career up to that point, and what a career. Taking in such films as Citizen Kane, The Stanger, Chimes of Midnight, Lady from Shanghai and many more; and featuring interviews with many who knew and worked with him, including Peter Bogdanovich, John Huston, Jeanne Moreau and Charlton Heston (who only agreed to sign on for Touch of Evil if Welles directed), this is well worth a couple of hours of your time.
Here’s the link to Part One