Mains supply in South Africa: 230 V, 50 Hz, sockets of Types C, M and N. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
Handy for multi-stop trips: Eswatini and Namibia use the same plug types. Travelling further to Zimbabwe, Sierra Leone and Kenya means a different adapter. In Africa, 3 of 55 recorded destinations use exactly this combination.
Protective earth
Grounded and ungrounded sockets may occur
Mixed supply: Type C without earth, Types M and N with earth. Which one is in your room only shows on arrival.