There is vast body of evidence (referenced in some part by davidbfpo) that the Selous Scouts concept was born from the BSAP Special Branch and drew from the experience of the Kenyan Police's Counter-Gangs against the Mau-Mau and the infamous "Ops Research Group" in Malaya.
Combine to all this that the British evolved the Counter Gang concept from both observing the covert operations of the Jews in Palestine (Mistaravim) dating back to WW1 and their own experience in India.
It has been suggested that the, "Ops Research Group" idea was in some part responsible for the CIA's "Phoenix Program" so I suggest this author is unencumbered by history on this one.
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