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I'm guessing the reason no one has answered is there are a lot of variables.
You are suggesting using the lighting ring to power an extractor fan via an isolator switch.
In basic terms there is no problem with that. If you can access the ceiling via the loft and take LN&E from the lighting loop to a fan isolation switch above the door of the room it's in. Then run the power back to the fan and run a switch live from the light switch line connection in the ceiling so the fan will start when the light is switched on.
The way you've asked the question makes me think you might not have done much electrical work in which case this is not really a beginners job. You could do it but it's not beginner stuff.
Make sure you work safely. If you don't know what safe working methods are for electrical work you should get a qualified electrician to do that job.
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Airhead
@tyeness
Potentially daft wiring question:
Is it safe to extend or spur from a lighting circuit to run an extractor fan (or two) in the loft?
Ideally each on its own isolator switch.
If so, in very basic terms how would i do it?