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No I won't. And yes I will. Thanks again.

Thank you Bernard Green. That was it. I picked another random cable (!)and this time it worked.

Hallelujah!

What about this? In order to get my power I just cut into a random lighting circuit cable in my loft. Could I have chosen the wrong one? Is it a problem with the feed?

Another clue: When the whole fan and light system is switched off the voltage across the live and neutral feed is 240; when it is switched on, the voltage throughout the circuit (before it gets to the transformer) is 50, that is, across the feed (L & N) and across all other points in the...

Right: I've checked all my wires and it's all exactly as drawn by ColJack above. I've tried the transformer both ways and the whole system fails in just the same way whichever way it is wired up. I flick the switch and this is what happens: the light flares up properly for about 5 or 10...

Thank you ColJack for your reply and drawing. That is exactly as I wired it. I'll check tomorrow morning that I don't have any crossed wires and that I wired up the transformer correctly.

Shower extractor fan and light problem. I have wired it up like this (ignoring earths for simplicity). I'll start at the junction box. There are three terminals here: Live, Switched Live and Neutral. Three wires are attached to the Live terminal: the first from the feed, the second to the...