I've got an overrun timer fan in my bathroom controlled from the
lighting pull-switch.

The builders who installed it (before my time here) put the (non
switched) Fused Unit in the (stud) wall above the bath (ca. 50 cm from
the shower head).

At present if the fuse is removed, the lights work, but the fan doesn't.

I would like to move the fused unit to outside the bathroom, as
recommended in the regs (required?) and replace it with a switched fuse
unit.
I want to be able to override the fan using the switch, but still be
able to use the lights.

All the diagrams I have seen for overrun fan wiring show the FSU in the
supply BEFORE the light and fan.

It doesn't seem logical to have a double-pole FSU going to the fan if
there's a switched live that may still be live even though the FSU is
open circuit.

How should I wire it to get what I want.

Part-P question: since I'm moving wiring OUT of the bathroom I'm
presumably in the clear?

Thanks

Funzbo