I hope I'll be able to help, but it seems you pay alot more attention to detail the I do.
The regular infantry helmets were died a beige colour with tea or coffee and had no badge on.
I beleive the officers had white helmets with the badges.
The terrain, as neil said on a different post was very grassy, about knee high, unlike in the film ZULU.
The four figures you refer to in the photo, I beleive are left to right
GEORGE PADRE SMITH-He distributed ammunition.
This one could either be Chard or Bromhead-I would say CHARD
Must say great work so far!
Hope this helps