Do you really think that there is a Kenyan BC for Zero in their archives? I ask this because I really don't know if they would or not. It would make sense, that if Kenya was a colony that they would have a BC for him there if Zero was born in a hospital. What if he was born out in the bush?
Because of white mother would have been registered in local area then transmitted to Mombassa for entry in British archives for nationality purposes.
Or transmitted by bush telegraph! (pun smile)