Replace the switch with a gridswitch plate with two spaces. In one
space of the gridswitch fit a switch, in the other fit a neon
indicator which comes on when the light is energised.
http://www.mkelectric.co.uk/products...p?RangeID=1026

Alternatively switches with neon indicators built in are available.


A good way of getting people to only pay quick trips I suppose.

Neon indicators usually need a neutral to work if "illuminated when
on" is required.

I have a similar problem of people leaving the bathrrom ligh(and fan)
on and am resigned to pulling a neutral feed through to switch.

There dont appear to be any lowcost or unobtrusive PIR switches
around.
Robert