...and finally, I've found him, thanks to the 1939 register!
Although I followed up all the deaths that looked possible, none seemed to fit. Last week I was searching the 1939 for someone and decided to check up on him once more. There was one in Rotherham who seemed to fit - exactly same birthdate and an unskilled labourer. As he'd landed back in Hull in Nov 1918, it was a possible. I checked the birth reg and the 1911 and worked out that the odds of it being someone else were pretty low. He was living with a Martha Parry, and two chidren - a Marjorie (b. 1927 and Edwards written in ) and a redacted son (from clues on the sheet, I've worked out that he was born in 1930). I checked up on a marriage and eventually found that he'd married a Martha Whitehouse ( mn Powell) , Dec q, 1937. The two children had been registered under both Whitehouse and Parry so he must have adopted them on marriage. With this info, I decided that it would be worth getting the marriage cert to confirm the details.
It arrived today - it was him as his father's details and age fit perfectly and he was single.
John died 4th Q, 1954, Rotherham.
His step daughter, Marjorie, married a Wilmot Lynus Edwards 2nd Quarter, 1947 and died 1st Q, 2001, Rotherham.
I assume, from the 1939 info being redacted, that the stepson, b. 1930 is still alive.
I now feel quite sad as my Mum (died 1999) thought her uncle had died and he'd been in Yorkshire all the time! It was one of those sad moments when I nearly went to the phone to tell her.
Gadget