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Anecdotally our plumber told us to be really careful what we choose
Yeah, that's the main thing I was getting at.
A mate used to do top end jobs in the most expensive parts of London. Post-work all outs to "fix" the underfloor heating were common, because no matter what was said flooring material was always a fashion choice and advice never headed.
Yes, in effect you want the carpet and underlay to do the opposite of what they normally do. I'm sure I read an article at some point about all this when we were installing ours. Anecdotally our plumber told us to be really careful what we choose, he had recently installed a system under thick reclaimed wood, and it was apparently costing them the earth to get heat into the house. We went with LVT for this reason.