Not long moved in and I am in the middle of decorating a bedroom and their is only one double socket in the room but on one wall their is a single socket which is the same size to a normal socket but the description is it has a small section on the left which looks like a fuse holder and a switch next to it, I was wondering if this can be changed to a double socket, it has 2.5 wiring into it but am not sure if it is live, the property is approx 1965 the wiring has been done but not the sockets, any ideas what this is or if I can renew it