We'll, I did think I had found him on 1939 register, living in Liverpool, a bricklayer, with a wife Mary at 34 Derby Street, Liverpool, same date of birth as my William. But looked on Electoral Registers for the address and found them there from 1937-1940. Then from 1945- 1951 Mary is on her own at 21 Derby Street, so made me think I was on right track. Until I looked at old newspapers online and found out that the William that lived at 21 Derby Street was killed in Western Europe on 8th February 1945 aged 30/32 . Looked on CWGC website and found this William and his details, but didn't say his dob !!