Bathroom extractor fan with dimming light switch

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I'm replacing the ceiling in my bathroom, and decided at the same time it might be nice to install a dimming pull-cord light switch (Screwfix sell one).

The only thing is that the extractor fan is fed from the lighting circuit (through an isolating switch next to the fan which I plan on replacing as it's poorly mounted and has seen better days - just generally scruffy).

The fan is the timed type that runs on for a few minutes after the light goes off.

I don't want to "dim" the supply to the extractor fan, so I'm thinking my only options are probably to:

-leave the circuit as-is with no dimmer
-install a separate pull-cord circuit for the fan,
-or possibly (and I don't know if this is feasible) install a relay on the lighting circuit to control the feed to the fan.

With regards the third option, is this feasible (and legal!) in a bathroom installation? I don't like the idea of two separate pull-cord switches, so it's either option 1 or 3 for me I think.

Many thanks!
 
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4) use a fan with a built in PIR or one that detects humidity (they are availiable).
 
5) some dimming pull switches have a separate switch for a fan which is not dimmed. You should also have an isolator for the fan.
 
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Thanks - I'll look for one of those. I do have an isolating switch for the fan, I'll be changing it though as it looks like it has seen better days!
 
Is there a fan available that detects nasty smells? This is often the only reason to have one!
 

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