Hi again
I have been going through John Duck's Military service record (quite a long one with many pages. His res. is 66 Grove Lane and he is a Bomber) and see that his wife is FLORENCE MABEL BENNETT.
They were married 9 Feb 190? at the Camberwell register Office
witnesses:
Beatrice M Bennett
Alfred Hudson
The date of marriage is 1900 but that has been crossed out and 1901 is written in underneath.
it also names his 7 children and their POB and DOB (including John Alfred Charles Duck 1906, I see he is on your family tree)
the only marriage I can see is
John HINTON Duck = Florence Mabel BENNETT
Mar q 1901 Camberwell

Jo, does your friend have John S Duck's marriage cert? If so what are the details?
deb