i have a man rose shower extractor with built in light. I wish for this to be on a separate light switch to the other bathroom lights, as it's above the shower cubicle and only needs switching in when that is used. My mate who is a sparky started wireing it up, but I think he is cutting a corner rather that put two light switches in he was using the bathroom light switch and an isolator next to it. I don't want this as it look crap. I think he was going to wire into the lighting circuit and use the isolator as the switch for the shower fan. Surely what I want is two light switches and then a separate isolator with that placed above the door? I.e. One light switch for existing lights and then a new one for the fan with its light?