Drainage pipe in the UK is almost exclusively plastic and has been for as long as I can remember, older installations have cast iron or glazed clay and sometimes an asbestos like material.
Copper or stainless is occasionally used for decorative purposes under basins but I've never seen it in 3 or 4".
I will try feeding the supply to the hot water through it to see if it's any use at all but right now I'm guessing it will be scrapped when the extension happens.
Steve
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