i got a switch which is wire like the one in last picture (link at the bottom)and going to replace it, and my mate said that i could but the blue wire in to L1 and the yellow in to L2 i say you can not do this so can you tell me who's right please.
http://www.diydoctor.org.uk/projects/lights_and_switches.htm
http://www.diydoctor.org.uk/projects/lights_and_switches.htm