Further to my earlier answer; various sources have her real name as being Sally Clark, Petula Sally Olwen Clark or Sally Owen and her being born 15th November 1932 or 1933. I have just looked at the Civil Registration for births for Dec Q 1932 and there is a Sally Clark listed (mother's name Phillips) registered Epsom. One source says she was Christened PSOC. Hope this helps! You could explain all this on your answer sheet :>)