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Thank you all for your help, but I am in the doghouse for posting my original question, as, unbeknown to me, 'er indoors had found or guessed a name for every picture, and posted the entry ! I had made a list of numbers only (as above) when I last saw the paperwork, but from memory, I think 20 was Lawrence Llewellyn Bowen and 51 was Guy Ritchie. That rules our entry out then !!!! I cannot recall 56 from memory, juliely.
Have just realised, also, that the 6th Feb closing date for entries is Tuesday, and not Sunday as stated in the quiz !