in cinema retro magazine # 2 and it be reveal that mark lester voice be actually dub by a 20 year old female and kathe green . although leste be consider perfect for the title role and director carol reed be not at all pleased with his sing ability . the secret be reveal by on a 2004 uk documentary title oliver . after they be famous . greene be pay 400 pound for her work and she have to agree to keep her participation secret and a do mark lester . they keep their word and only reveal this fact a part of the tv show decade after release of the film . for the record and mark lester retire from act and be a practice osteopath in england .