Hello Brian,
I decided to take a look in the book 'The war of a hundred days' by James Brown, in which it describes the officer on the far right as being a Major H. Greenwood of an artillery unit. It's not 100% certain, though. The person on the left that you are referring to is, if I'm not mistaken, Lieutenant-Colonel W. Kirby of the 3rd Battalion Transvaal Scottish.
As for the gaiters, pictures of soldiers/officers wearing them are fairly scarce to come by. So far I've seen a few pictures of Dan Pienaar wearing them in East Africa, a soldier in North Africa wearing them, and the photo I already posted here.
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