Hi can anyone help me: My boyfriend has wired up a new dimmer switch replacing a one way switch for two lights (working at the same time) incorrectly! I didn't see how the old switch was wired up but I have got two cables; one with one black (Neutral), one red (live) and a bare (earth) wire, and the other with yellow, blue, red and bare wires. Which wires need to go to which ports on the dimmer? I'm assuming both bare wires need to be connected to the metal faceplate earth port. I only need the dimmer to work both lounge lights at the same time not independently. There is L1 & L2 ports plus a wavey line with an arrow pointing top right. Thanks for anyones help on this.