I am still around because I have never had a response to my question until now.
Unfortunately the wiring to the switch is obviously not suitable.
At least I can now rest in peace.
Thank you all for the replies.
I need the switch to tell me that the bathroom fan is going.
The long story is that I wanted to dim the (new) lights and had a pull dimmer fitted (inside the bathroom). This setup didn't kick the fan control because (I think) the dimmer switch reduced the...
I need to fit a neon indicator switch in place of an ordinary light switch. Unfortunately there is only one wire to and from the switch (plus an earth).
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I understand that I also need a "neutral" wire to...