Abstract: Electrical supply apparatus (201) for providing electrical power to a first type of socket and a second type of socket (410). The apparatus comprises an electrical power source (420) for providing electrical power, a first mains circuit (204) for conveying electrical power to the first type of socket, a second mains circuit (208) for conveying electrical power to the second type of socket, and a control unit (210) configured to interrupt the supply of electrical power through the second mains circuit, and thus to the second type of socket. The interruption of electrical power through the second mains circuit does not interrupt the supply of electrical power to the first type of socket.