Just bought a new light fitting for downstairs toilet, it has the usual live,nuetral and earth and is the screw in bulb type, The wiring from the old ceiling rose was 3 earth wire and 3 red wires connected to the base and 3 black wires which went to the bulb holder, one was connected to one of the pins at the bottom of the bulb holder and the other two were connected to the other pin at the bottom of the bulb holder, can anybody give me any clues on how to wire this up i am presuming that one of the black wires is actually connected to the light switch