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Right, so get my hands on a voltmeter to find which is which, thus avoiding blowing up my fire alarms...

Thanks, so if I get it wrong, I presume my fire alarms will go off, and if I get it right, all will be well!?

Can I wire in my lights (2core) to the fire alarm (3core) if so does blue go to black or grey? Or have I completely not understood the 3 core wire, which is frankly quite likely!