This can get a wee bit technical, but in a standard bathroom, but a very easy way of telling what might be in the zone:
Zone 2 - If you can stand in the bath, shower, or spa etc, and reach out the furthest you can, that is likely to be inside zone 2.
Zone 1 - The footprint of your bath / shower enclosure, up to a height of 2250mm from the floor, or higher if your shower head happens to be higher.
Zone 0 - Inside the part of the shower enclosure or bath that can hold water. Generally the full height of the bath or the full height of the shower tray (couple of inches). You can get a better visual representation of the zones elsewhere.
Although not everything in the bathroom might sit in the zones of the special location, electrical accessories, and current using equipment, and any part of the electrical installation that runs through these special locations do. These will need signing off by a Part P electrician. And if we're honest, if you're having work done on electrics in the bathroom, you're best off asking a Part P electrician to do them, even if they don't strictly require Part P notification.
