Is this wrong isolater

[2020c]

Then it would be fine to use a switch.

Mine was flush fitting, as I mounted a back box into the ceiling before I plasterboarded.
You could possibly cut a slot in the ceiling for a drylining backbox, or fit a slim surface mount backbox.
It wouldn't look as neat, but you would have had to do similar with the pull cord switch anyway.

I always thought one wasn't allowed any switches in a bathroom/ensuite. Just pull cords.

It's a 65mm insulated plasterboard on the ceiling.

 

[JohnW2]

I always thought one wasn't allowed any switches in a bathroom/ensuite. Just pull cords.

As you've been told, ordinary switches have always been allowed provided they are not in certain defined 'zones' (primarilky within 600mm of a bath or shower).

The UK (but few other countries) seems to have, for some reason, fallen in love with pull switches in bathrooms, but there has never been any 'requirement' to have them (unless the room is so small that a wall switch could not be 600mm from bath/shower).

Kind Regards, John

 

[SUNRAY]

Would it be practical to have the switch elsewhere, such as in the loft etc?