My woodland shares a boundary with a farmer's field that looks like it's occupied by Aberdeen Angus. Just recently I noticed that someone, premuably at the behest of the farmer, has been along the boundary witha flailer. There is a fence that clearly damarkates this boundary but the flailer has clearly reached on to my land to destroy anything that is growing within about 4 feet of the fence. This is mainly bracken but also some saplings and a holly tree of reasonable stature. I'm assuming he would like some sort of buffer zone, so that his cattle don't graze anything poisonous. Any ideas? Am I obliged to maintain a buffer zone or has he just shown blatant disregard?