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@Dammit
From my diagram up the page, here is what I think is what:
You can see the main "L" and "N" identified, and the extractor is on a new circuit taken from those two wires, where there are existing junctions.
The switched live for the lighting circuit is identified, and to get power to the T on the extractor I am running a wire from the switched live side of the light switch to the 3 pole isolator, and onto the T.
If I turn the light switch off, interrupting the switched live (checked by seeing the lights go off) the fan keeps going beyond the 120 seconds of the timer.
Operating the 3 pole isolator turns the fan off.