The African cultural references here are rather silly. The so-called African music is in a made-up style that sounds more like south east Asia and has no relation to Maasai music by even the slightest degree. Also, Higgins refers to the Kikuyu as being a savage tribe. Historically, the Kikuyus are the tribe that was the most accommodating to the British. When the Uganda Railway was being built in the 19th century, the Kikuyus were open to trade with the British and many Kikuyu were hired in various capacities. In contrast, the Nandi tribe was extremely hostile. The Mau Mau rebellion of the 1950s did center largely on the Kikuyu, and some atrocities took place. As Higgins mentions, however, the British also committed some atrocities.
Villages in Kenya are not surrounded by flimsy screens of narrow sticks. Most have no sort of barrier whatsoever. In areas where dangerous predators are found, permanent villages are surrounded by a dense ring of dagger bushes or by a thicket of cut branches from acacias (thorn trees).
The highly-polished spear point is completely out of place. Such a spearpoint would not come from Kenya.
Bebe Kiamonni claims that she lived in England from childhood, yet she does not have a British accent, which she most certainly should have had. She doesn't because it is revealed later in the show that she is, in fact, not from England but from Kenya.
Kenya, like many other cultures, is strongly male-dominated. While women work for the CID, for a woman to be an agent - and in particular, one dispatched for an overseas mission - would be unheard of, particularly back in the 1980s.
Higgins referred to the African bush as being a place where everything is killing or being killed. This is a bit over-the-top, as it could describe most unpopulated areas on earth, including the United States. While an Englishman (who grew up in a place where there was no wilderness) might characterize the plains of Africa as being exceedingly dangerous, this is an exaggeration. And it should also be noticed that "jungle" is not a term commonly associated with Kenya, as this only exists along a narrow band of the coast and in the far west.
It is not revealed whether the three ex-soldiers of Higgins' unit (Privates Buckminster, Taylor and Lance Corporal Crawford), who were allegedly killed by the Mau Mau, were actually killed by Edwin.