For us it turns out that when i face the back of the property
the right side fence is my responsibility
I think grantway's got something here. Many years ago, when I was young(er), my dad had a dispute about a fence with our neighbours. They had massive weeds and creepers growing, that pushed the fence over. We asked them to uproot the weeds so we could sort the fence out, then they got all arsey and said it was their fence, but the deeds said it was clearly ours. They refused to sort it, the bastards, leaving us with a fence collapsing into our garden
Some weedkiller when they were out, sorted the problem…
The wall on the other side (left) fell down, and we had another small dispute with those neighbours, but that was sorted when they checked their deeds, and built a new one.