Our house is a long way from our neighbours house and we have only briefly net them to say hello to in passing since they moved in six months ago. When we left home this morning we saw that our garden wall has been knocked down. This is not a wall that separates the two properties but it goes along our driveway over which they have a right of way. The wall itself was fine but a pillar had fallen down and we just hasn't got around to having it fixed. They are clearly now getting it fixed ! I am torn about whether to go to their house and point out that the wall is ours. This will no doubt cause tension since they must surely think it is theirs. We wouldnt have had it fixed for months since it was very low priority on our list of a million jobs. On the other hand it looks like they are trying to widen the access or something which I don't want to do. What would you do?