I need assistance hard wiring two wall lights in my downstairs bathroom. When the main light is switched on, it also starts the extractor fan that is on the top of the rear wall. I'd like to run the sparks off the fan, drop the wires behind the plasterboard wall and place either side of where the mirror will be going. The holes need to be covered by the wall light. The lights i am thinking of getting are - https://www.next.co.uk/style/su001042/193761