I want a bathroom ceiling extractor fan added. The plan is this: inlet grill above shower, 2m ducting running to an inline fan mounted above a bedroom, then 1m duct to an eaves outlet. All wiring would be in the loft; live, neutral, earth and switched live taken from the bathroom light junction box to the fan via a 3 pole isolator switch mounted outside the bathroom above the door. Is this notifiable under part p?