I need to install two linked mains powered smoke detectors. There are no spare ways in the consumer unit so they will have to be fed from a lighting circuit. The question is - is this notifiable work because it is not a new circuit back to the CU but neither is it an additional lighting point. There does not seem to be any mention of smoke alarms on the various lists of notifiable/non-notifiable work that I can find, the regs also seem to ignore them from what I can see.