Thanks for the quick answer.
Easiest option would be to run it off the permanent supply run off the RCD/MCB as it would mean putting the accessible SFCU in the attic and would be easier and less time consuming just to flick the MCB in the garage. Thanks again
My mirror is presently wired into the bathroom down lights. I would like to use it independently of these, as it has it's own infra red switch.
Do regs require this to be off its own isolated supply in this case.?