For you that are interested primarily with South Africa
58thFootMountedInfantry-573x949.jpg
Cpl James Osborne, V.C. serving with the Mounted Infantry of the 58th Foot. Complete with shako plate
WelchRegiment.jpg
Either Welch Regt or North Staffs full H.S. helmet plate here.
CaptainHebdenEssexRegiment-800x1197.jpg
Captain Hebden, Essex Regt - nice shot of the regimental title here.
Bertram_Noel_Denison.jpg
Bertam Noel Dennison - 2nd Bn,KOYLI
HelmetedArtillerymanThumb2.gif
Gunner, R.A. - taken India possibly bound for S.A. Helmet appears plain
BridlerCorporalTomRA-800x1172.jpg
Another possiblr gunner or MI - helmet appears to be plain.
All of these photo's are with thanks to "Soldiers of the Queen", which is possibly one of the best photographic uniform sites on the net.
I'll trawl around for other Boer War photo's. Another good source for period uniforms is the Fosten Brothers "The Thin Red Line", which is full of coloured plates following the evolvement of British Army uniforms.