Evenin', I've had a chat with a spark who popped round to take a look at the wiring for an inline extractor fan in my bathroom. I've run the wires but haven't connected anything up. He'll be back to do that and check things over. He said that there's no need for the FCU that I'd bought: https://www.screwfix.com/p/mk-13a-unswitched-fused-connection-unit-metal-clad/22894 The reason that I bought it was because I thought that in order to comply with Part P you needed to have the fan protected by a fuse as specified by the fan manufacturer. The instructions say 3A. The lighting circuit is 6A. Have I misunderstood the regs? If indeed I do need an FCU, would it simply be inserted as per the red text/arrow in the attached diagram? My fan is actually a timed fan so I appreciate it'd be 3-core rather than 2-core and earth as per the diagram (it was the closest I could find that I could easily edit). Thanks, Jimmy.