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Thanks very much for all your advice - it sounds like it's time to take up the floorboards and fit LEDs!

Thanks for all the responses! The bulbs are 12 V They aren't dimmable Each circuit has at least one failed bulb There's not much wiring I can pull down, but I will take some photos of what I can see in the roof space Thanks again Mike

I have 4 groups of 4 downlighters in the living room ceiling (one wall switch for each group). They are all Halogen bulbs. Over the years several have failed: there is no longer any current flow to these ones (bulbs themselves have not blown). All the other bulbs are still fine. Unfortunately...