 The role was written with him in mind but was finally taken by Alec Guinness, who, in the words of Mark Duguid of the British Film Institute, played it "with more than a hint of Sim about him", to the extent that according to Simpson many people thought then and still think that Sim played the part.Sim's performance in "Scrooge" (1951) is considered by many to be the best portrayal of the title character on screen, and it is among his best known film roles, particularly in the U.S.In the farcical "The Belles of St Trinian's" (1954) he played the dual roles of Millicent and Clarence Fritton, the headmistress of St Trinian's and her shady brother.