I have just replaced two existing wall lights with two new ones. The lights work off one wall switch. Having put the first light up, I tried it, and it worked fine However, having put the second one up - went to try it and now neither light works Have I done something wrong? it is to do with them both being on one circuit..should I have wired it differently ..or is it something to do with the lightswitch on the wall? I checked the fuses down the basement and they are all fine & have replaced single lights before with no problem. Can any one help. Many thanks Jenny