Hi,
Welcome to Rootschat

A piece in the Lincolnshire Echo mentions his marriage in Oct 1939, Kathleens parents are mentioned but not Johns.
He is mentioned as being a serjeant in the Lincolnshire Regiment and his best man was an army friend .Sounds like he did nt possibly know his father.
He was still in the army ( WO2) in 1953 when they had a child, mention of the name Bunny, not sure if his nickname.
So it seems either he was born J W Maw but possibly a different year or born under another surname and his mother married a Maw, or just assumed his surname.
I m sure there s an answer somewhere out there, hopefully other rootschatters might have some info.
Do you know when/ where he died, that might help.Do you have his address on the marriage certificate?
Cathy
