Dont want to confuse with this information but may be worth perusal??
John/Jack Jay married Vera as John William Jay and the marriage cert shows his father as Frank Jay
This is the marriage of his parents
25 Dec 1909
Frank Jay 25 B Clerk 174 Baker St Alvaston Derby father George William Jay occ Carter
Florence Beatrice Kniveton 27 S Duffield father Alfred Kniveton occ Brasswork foreman
Witnesses Alfred Kniveton Alfred Kniveton (was entered twice) J W Pawlsen
all signed
so possibly John's middle name of William was after his grandfather George William??
His mother Florence Beatrice was born30July 1882 and died 5 Sept 1971
Probate
Florence beatrice Jay of the Pastures Hospital Mickleover Derbys died 5 Sept 1971 Administration Newcastle Upon TYne 18 Jan
Effects £845
Did Florence Beatrice live/work or was a patient at the hospital?
The Pastures was known as a lunatic asylum - it was a mental health hospital - my aunt was a patient there (on and off)from 1950's after death of her young son until late 1970's when she commited suicide)
Did Florence have any other children who maybe died in infancy ??
Was John William Jay her son or a child her and her husband Frank reared??
If so what name was he registered in??
I did some derbyshire research for a frien and there was a female who I could not find a birth reg for -when I showed the research to my friend's mother (in her nineties ) she said oh yes that's aunt so and so they found her on an ash tip and reared her as part of the family -as they used to do in those days .
All kinds of scenarios are possibilities
It may be worth looking for Jay illegit births -or Jay s who married and were widowed or died and so the child (John) went to other members of the family
All just my thoughts
It may be worth applying for John 's RAF records
Possibly posting Vera's picture on the armed forces section could give further insight into who she served with - note that she was a nurse
I will see if I can find anything further later today - hope this hasnt totally confused
Vera Jay died 1976 and if John's death is the one in Cardiganshire is it possible he remarried?
Suz