Hi.
Thanks for everyone's replies so far.
I am 99% sure the Diane Liddle mentioned is not related to this George Thompson. He and his wife Millie (yes I know - George and Mildred...) had no children that I ever knew of.
The only other nugget of information I can think of to help is that George Thompson lived in Sheffield (as I did obviously) and had a career up to retirement with Laycock's (the gearbox and overdrive company) also in Sheffield.
I remember he had 4 perfect Airfix models he kept on his sideboard: a Beaufighter and a Mossie (his steeds) plus a Betty and Dinah (his adversaries).
He and Millie retired to the Burley-in-Wharfedale area in the early 80's I guess.