hi, in my bedroom i have a light which can be turned on/off using the wall switch or a ceiling light pull. the rope on the ceiling pull has snapped so we have bough a new ceiling light pull to replace it, we were advised by the salesperson to get a two way switch. the old light pull has been removed and we wrote down the colours about what went where but we have now lost the paper!! there are four wires showing, a green/yellow one, red, black and a grey one which looks like it is covering another red one. on the switch you have L1, L2 and com and obviously the earth bit. which wire connects to where? thanks