Panzerjager does have a point.

1. South Africa is one of the few stable mineral rich African countries, and it was run by whites, and did very well for itself.

2. Rhodesia had money coming out of it's earlobes before it became Zimbabwe under Mugabe.

3. Australia is white, has a white majority, and is alot more homogenous than any African country.

India is really the only example of a former British colony maintaining a stable independence, and that's through a strong nationalism and independence movement under Gandhi. The British did allow many Indians into low-level government jobs, ensuring that the bureaucracy was functioning before handing it over to the politicians.

Other African nations had entirely European governments. Namely the Congo (I watched Lumumba).
They were ready, but the Belgians were too ingrained in the system for independence to work.