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TooTallTim-
No worries, everyone starts clueless. You posted 3 images, I gather the first one is the new fan, the 3rd one is the old extractor fan, what's the second one? It looks like a transformer, was it already there or did it come with the new extractor?
Transformers convert voltage from your mains (240V) down to some other voltage. What I'm thinking is your electrcian was right, your cables are indeed live, but perhaps they are at the wrong voltage for what your new fan needs.
Hovis
Is there a transformer involved with either the old fan or the new fan?