In article ,
Dave writes:
Lurch wrote:
... snipped

I'd be inclined to fit a triple pole fan isolator instead of a
switched spur.
... snipped

Why does it need to be triple pole? Take the feed to the fan through a
standard 2 pole isolator and then wire from the fan to the switch (and
light, if needed). What am I missing?

Might be a bit of a bugger servicing the fan if the
isolation switch also disables the bathroom light.

--
Andrew Gabriel