The grid in Egypt works at 230 V and 50 Hz; the recorded sockets are Types C and F. No surprises on voltage: Egypt runs at 230 V, the same range as at home in the UK.
The same socket system is used in Angola, Sao Tome and Principe, Algeria and Cabo Verde, so one adapter covers all of them. Travelling further to Uganda, Zimbabwe and Lesotho means a different adapter. 7 of the 55 destinations in Africa share the plug types of Egypt.
Protective earth
Grounded and ungrounded sockets may occur
Egypt has sockets with a protective earth (Type F) and without (Type C). A plug that fits mechanically does not guarantee earthing.