The light T&E was already connected to the switch with the supply - I've disconnected the 3-core connections and earth leaving the light and supply wired as before.
It's all working fine now, thanks for the help!
The wiring is all connected to the upstairs lighting circuit by a wire coming in from the bottom left of the switch.
Here's the switch:
The light:
The fan:
The wiring conduit:
I'd like to diconnect the extractor fan in the upstairs toilet. It's a small room, well ventilated with a window and nothing in there but the loo.
It's connected to the light switch and I'm guessing the light and fan are on their own spur (previous house owner installed it).
The switch has...