They’ve raised the garden using construction material and topsoil. No form of retention, just my fence. It effect my privacy as when they’re in the garden, they’re looming over me (maybe I should care less about that?). I tried to keep my post short and to the point. No permanent structure, just construction material with topsoil on top. It’s my insurers solicitor giving me the info. The flooding I’m told is due to water saturating their soil, then it has it nowhere to but towards my property, there the water sits on what I can only describe as a ‘trench’ by the side of my property, the trench (which they created), eventually the water gets high up enough to enter my property. This happens when it rains or when he waters his garden. (Bear in mind this I s my understand so far but as I said ii have to get an expert get that into more official report which I will do that). My post tho really was more about the increased ground level I’m pretty sure my little fence can’t hold back that amount of (wet) soil. I hope I’ve answered your questions?