In Cinema Retro magazine #2,it is revealed that Mark Lester's voice was actually dubbed by a 20 year old female, Kathe Green. Although Leste was considered perfect for the title role, director Carol Reed was not at all pleased with his singing abilities. The secret was revealed by on a 2004 UK documentary titled "Oliver! After They Were Famous". Greene was paid 400 pounds for her work and she had to agree to keep her participation secret, as did Mark Lester. They kept their word and only revealed this fact as part of the TV show decades after release of the film. For the record, Mark Lester retired from acting and is a practicing osteopath in England.