I do have some records for a couple of graves:
Belfast (South Africa): These are graves of 1st Gordon Highlanders:
Pte. G. Smith. no. 3285. 12/01/1900
Pte. A. Brotherston. No. 6442. 08/01/1901
Pte. J. Smith. No. 4137. 19/11/1900
Pte. T. Taylor. No. 4127. 13/11/1900
Pte. J. Fraser. No. 6984. 05/01/1901.
Waterval Boven: 1st Gordon Highlanders (1st Batt):
Pte. J. Findlay. No. 2031. 13/08/1901
I do know that the Scottish Rifles had a campsite near the town of Greylingstad. The campsite is on a hillside and you can clearly see the layout of the camp and the tracks made by wagons etc. I have visited the site, I do not know if anyone from this regiment is buried at Greylingstad, but will go and check it out the next time I am in South Africa.
I still need to go through a few photos etc and will get back to you.