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Thanks for the info Bold, I didn't realise it was such a minefield. Looks like those wall insults might come in useful! ;-)

I've recently moved into a house that was built in around 1992. We've had some work done on the fireplace which gave me a chance to see the wall cavity. I've attached a photo below, which shows that a sheet of polystyrene has been used, the sheet fills about 1/3 of the gap. So I have two...