Hi guys, im building a new understairs WC and theres never been electrics in that space before. I am of course wiring in a ceiling light and extractor fan under there but would like to know how to 'rough in' the wiring for an electrician to connect later? I have the basics locked in already in terms of the light switch box and routing the wire (twin and earth) inside ducting in the stud wall and into the ceiling to the light fixture and fan. 1. is the wiring between switch light simple when there is a fan to loop in also? ( id be reasonably comfortable tacking this with a good guide that anyone could point me to? 2. when would the power to the light switch typically be picked up from? this part I will likely get an electrician in to do but would like to know where to plan the power from?