Please add: Reginald Saterley Cooper
Rifleman (1312) Reginald Saterley Cooper, "A" Coy., London Regt (First Surrey Rifles), died 30 June 1915 aged 23. He is buried in Vieille-Chapelle New Military Cemetery, Lacouture Pas De Calais, France.
Richard IWM Volunteer commented
His page can be found here https://livesofthefirstworldwar.org/lifestory/953307
The records are initially created from the medal cards and they rarely show middle names, initials as in this case are most common. I have added a few bits of evidence to his page for you