There is also the possibility of the marriage in West Ham:
Registered: June Q 1919
Arthur T Russell
to Mabel E Reed
West Ham
v4a p867
A marriage certificate would at least give you his father's name and occupation, but I know it can be a waste of money if incorrect!
Sometimes people don't use the middle name on official documents either, or acquire one post birth registration, which makes searching for a death or marriage tricky.
