Bryan Farwell devotes at least a chapter to Spicer-Simson's actions in East Africa in his The Great War in Africa.

Interestingly, the 4th Battalion of the King's African Rifles wore a solid green kilt at one point in its history, due to the influence of Scottish officers:

http://www.chakoten.dk/cgi-bin/fm.cgi?n=855

And one would be remiss in not mention Col. Colin Campbell "Mad Mitch" Mitchell, who served with the KAR for a time. It is believe that Idi Amin's fascination with all thing Scottish began with his service in the KAR.

T.