Tim S wrote:

Would it be permissable to use a water proof wall switch (the sort with a
membrane over the rocker) in a bathroom (I forget the definition of zone
1,2 etc, but on the wall by the door within 1m of the bath and basin but
2m from the shower)? Not as pretty though...

You can use an ordinary switch in Zone 3 - i.e. more than 600mm from the
nearest edge of the bath or shower tray. Switchgear closer to the bath
than that needs to be SELV, not exceeding a nominal 12 V AC (or 30V DC).

--
Andy