I recently contacted Mr Anthony Perry after reading his small book on the making of The Yellow Submarine in which he has written a chapter on his association with Dick Williams. Mr Perry was a producer on the Beatles picture and helped set up Dick in his first studio space. With permission I've scanned the chapter on Dick to post here.
Mr Perry's book makes for a fascinating read about how & why The Yellow Submarine was produced-it only costs £3 and is available from the Cartoon Museum, London.