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I would guess their plumbing is downstream of the offending tree root. My GF is new to the area, her neighbours have been there for years. Their response (which sounds well rehearsed) is that they are not affected, it’s someone else’s problem even though it’s their negligence that has caused it. But that can’t be proved without first entering the house then digging up the garden and, well, you know what you can do with that idea, matey.
My GF has one towering over her garden. She lives in a C19th terrace and it’s in next doors garden barely 10ft from the back of their property and 20ft from hers. Not surprisingly she has had trouble with her drains not clearing and the neighbours are being total s**ts about allowing access to the Southwest Water engineers who have positively identified a high spot in the pipe work under their garden. They know fine well the tree is to blame and removing it would cost them dear. Wondering if the water company has the power to force them to fell the tree on the grounds of basic sanitation.