Bear in mind when searching the 1939 register, that your George Henry was born in 1915 and if he was in the forces in September 1939 he will not be listed.
I'd look for his parents (unless you already know they died before then?) and see where they were living, then I'd try the Newcastle electoral rolls on Ancestry for just before and just after the war.
If you don't have a sub to ancestry then your local library may well provide access on the premises.
Boo