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It's true, but I think they are quite unique.
On the subject of chimneys, our builders found the main chimney breasts had been taken out and that the stack was being supported by a shelf and two strong-looking shelf brackets.
Then they took the ceiling out of the extension and found the chimneys there had been held up by rotten wood and rust nails nailed into brick - which they pulled out by hand once they'd removed the chimneys.
I don't think they're worth the risk. If there's any kind of chance of tonnes of brickwork crashing down on your bed/kitchen then I'd recommend removing it.
I call shenanigans