Land drain found crossing foundations. Drainage and wastage systems and plumbing help, advice and answers

[Cobra]

Whilst underpinning found an old clay oval land drain with water running from neighbours. Do I fix or seal up?

[Bodjit&Leggit]

My understanding is that anything running through your property is your responsibility, but no matter what, I'd repair the drain, especially if water is still flowing through it. Had a friend whose back wall of their victorian terrace began to crack and sink purely due to the neighbours breaking a drain. Became very costly for all.