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Fair point about the earth, brown-nought. There might be enough slack in the cable to rectify things. Sure enough, the fan does not work at all with the light bulb out ! I've checked the wiring in the rose and everything looks OK - all red wires going into the loop, the switch neutral going...

Don't understand about carrying the earth to the fan - there is no earth terminal in the fan and the instructions do say that, being double insulated, it does not require an earth. I'll carry out the checks you suggest.

The supply is taken from the permanent live and neutral terminals on the light's ceiling rose. The earth wire from the isolating switch to the fan is cut and terminated at both ends. The light itself is operated from a two-way switch wired up for one-way use.

I am installing an integral pullcord-operated bathroom extractor with no timer overrun. The fan is powered from the mains lighting circuit via a triple-pole isolating switch. I want the fan to work independently of the light. Therefore, I have taken the permanent live and neutral from the...