Non
South Africa
The UK actually had many colonies in Africa! The British owned parts of Africa all the way from the 1600's to 1980.
Nigeria is the name of the British colony in West Africa.
Liberia. (Since the 1970's there haven't been any Colonies in West Africa, though).
Egypt being the Most northern British colony in Africa and South Africa being the most Southern colony in Africa.
The first colony in Africa was the Greek controlled areas of Egypt in the 500's BC.
They didnt become a colony
There were a great many countries that never were under British control. There were even more that were not a British colony before they were declared independent. On the great continent of Africa there is only one. That would be Ethiopia.
the dutch cape colony in South Africa
Dahomey (French colony until 1958)
Cape Colony. It was transferred to the United Kingdom in 1806.