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The switched live needs to come from the bathroom light pullcord. It'll turn the fan on when the light is turned on then a timer will run the fan for a few minutes after the light is switched off.
The fan has it's own switch, outside the bathroom, that then passes (via a cable, obvs) through a three pole isolator and into the bathroom.
I don't really want to link it to the lighting circuit, which at the moment is completely separate.
I can't see a reason why supplying live to both L and T with neutral to the N won't work?
Dammit-
The fan has it's own switch, outside the bathroom, that then passes (via a cable, obvs) through a three pole isolator and into the bathroom.
How is the 3 pole isolator wired, if you have only 2 cores at the fan?
You don't need one, as far as I'm aware, if you're using an independent switch.
[Edit] https://www.manualslib.com/manual/1164118/Xpelair-C4s.html?page=8#manual
The instructions suggest you leave the switched live terminal disconnected
NotThamesWater
The switched live needs to come from the bathroom light pullcord. It'll turn the fan on when the light is turned on then a timer will run the fan for a few minutes after the light is switched off.