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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 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?