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So to be clear, blank off the permanent live, then branch the switched lived to both live and switched live connector. That will then only run the fan when the switch is on? Cheers for the first reply!

Scratch that, it doesn't run without the permanent live, will see if I can swop for a timed version.

What if I disconnect the permanent live and make that safe? So it just runs with neutral and switched live? It's on the light circuit remember for the bathroom. Wires now identified, so grey neutral, brown live, and black switched live. Used multimeter, and bridged earth to each wire in turn...

Thanks again, it's a Vent Axia vasf 100b, much quieter than old unit. Maybe some distorsion, so I'll check that too.

ps - to check for permanent and switched live I turn off the power, bridge across neutral and "live" with multimeter on continuity with light switch off, and then on to detect continuity?

Thanks, any thoughts why the unit would buzz quietly when I swopped the two "live" wires? When I did this it did work properly, but was a bit concerned by noise.

Just replaced a noisy fan with new quiet one, but it's permanently on. One cable with three core wires and a earth core running into the fan. I've wired the brown to live, black to switched live, and grey to neutral, and this leaves the fan permanently on. Have I ballsed it up with colours...