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Is this the death registration of your grandfather?
Alfred R Hardwick
Age at at death 58
born about 1900
Registration Date: March 1958
Registration district: Fulham, London
Vol 5c Page 567

Did he marry a Dorothy Goldsmith? They are together on the 1939 register. She died in Derbyshire in 1976.

You have the above information but are just wanting to find out what happend to him between 1951 and 1958?
Christina