As there is no earth on your lighting circuit you should not be adding an extractor fan (or anything else) to the circuit.

I'm completely stuck. i think the problem is with the pull-down ceiling rose. it only has two inputs - one Red and One Black running to COM and L2 respectively (and an Earth.) I can't figure out where the switched live from the fan should go! There's no place in the pull-down for it to go. Think I'll need to pay a sparky for this job!

The permanent live goes to com, the switched live from L2 to the fan.

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....

OK, but what about the neutral, Wino~o!!

Are you wiring via a junction box?

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....

I was hoping to wire it directly to the pull-down light, wino~o.

Done it. Thanks for the various peices of info, all!