Mains supply in Cabo Verde: 230 V, 50 Hz, sockets of Types C and F. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
The same socket system is used in Egypt, Angola, Guinea-Bissau and Guinea, so one adapter covers all of them. Watch out when moving on: Ghana, Uganda and the Gambia use a completely different system. 7 of the 55 destinations in Africa share the plug types of Cabo Verde.
Protective earth
Grounded and ungrounded sockets may occur
Not every socket in Cabo Verde is earthed: Type F yes, Type C no. Class I appliances belong in an earthed outlet.