The building site next to us decided to pump out a hole they’ve dug into a ditch - rather naughty to start with, but it hadn’t dawned on them that the ditch ran into a stream which then goes through our neighbours garden.
Long story short - pictures sent, phone calls made, head of H&S for the site comes to apologise. Asked what my husband does for a living - you should have seen his face when he said “Environment and Health and Safety Auditing!!”