I have added some Cheap sockets to my ring main, Double socket above double socket so instead of two plug holes now have four plug holes. Two wires twin and earth 2.5mm in original socket with one twin and earth 2.5 mm going to the new socket . Only thing is only one plug hole works on the spur both work on the replacement original double socket. Have i done something wrong or is it the cheap £1.29 double sockets i have bought? Thanks B.