Thank you so much for your attempts - it helps to be able to rule out certain Alfreds at least.
Alfred Mullinger (34638) - discharge in 1917 for being no longer physically fit for service (para 392, xvi). Looks like 'wounds' inputted. Born 1883. King's Own Yorkshire Light Infantry regiment.
I believe this is the Alfred Thomas Mullinger went on to marry Florence Watson in 1935 that is potentially discounted, but are we certain? Father's name is William - could it be William George?
It's not Alfred Bertie Mullinger of 9 Rosemary Avenue, married to Emma Edith. Or the Alfred Mullinger married to Olive Kate (Manchester regiment).
Could it be the Alfred & Mary Ann Mullinger living at 29 Western Road in Norwood in 1922-1927? Bizarelly, in 1921, it's Alfred & Annie Florence Mullinger living there!
There's an Alfred Frederick Mullinger living at 41 Featherstone Road in 1927. In 1926 at the same address there is a Mary Ann living there also. I think I crossed this one out before but can't remember why.
An Alfred S Mullinger marries a Gertrude M Henrey in Norfolk in 1920, so unlikely to be him? I believe the middle name is Samson.
This is the marriage record between Alfred & Mary Ann, where he lists his father:
Do the markings under George Mullinger (D/C??) mean that by this time, he is deceased? And am I right in thinking 'paper hanger' could count for painter/decorator (as in wallpaper hanging)?
If so, I found a death record of a George Mullinger in 1897 at the age of 50, profession listed as house decorator in Pancras. His sister in law (Ell__ B__ (can't really make it out, will attach it below)) was present at the time of death. Can't make out the cause of death either. I think he was married to a Hester/Hesther/Esther.
There also seems to be a George Mullinger that lived in Leytonstone, married to an Elizabeth.