I'm annoyed with my neighbours. Before they moved in next door we put up a fence which was about 6" from the boundary (marked by concrete posts and a wire). This was deliberate so that if we needed to do anything like replace the posts we would have a little wiggle-room and not encroach. They started removing the posts and we told them that they should have left them as they mark the boundary - so they left one. Then they painted their side of our fence (without asking) as they wanted to put up plant support wire on the fence (without asking) and grow things up it. Then they put a couple of bike-sheds right up against the fence (but on a concrete apron which was already there). Now they have built up another apron, this time with compacted earth and gravel, again right up against the fence, where there was just lawn on their side. We only noticed this as one of the fenceposts has to be reconcreted as it's got wobbly due to recent winds. They have put some sort of barrier (metal strips and then a barrier of paving slabs which are right against the fence - "so the earth isn't touching the fence") which they think is fine, but the fact remains that they are over the boundary line, and putting something pretty permanent down, on which they intend to put more bike sheds and a greenhouse. What's really irritating about this is that they just do this stuff and assume it's all fine. 6" sound petty - but when you multiply it by the length of the garden which is about 90', it works out to quite a lot of land.... and it also makes it impossible for us to ever replace the fence and, say, plant a hedge on the boundary line, if they have put sheds and what-have-you. OH's instant reaction to this was 'well they'll have to move it' - but he doesn't like confrontational stuff so it will be down to me to go and talk to them. We are within our rights to tell them they need to take the work back to the boundary line - but what's the best way to go about this? Letter? Knock on the door and have a chat? We don't know them all that well as they keep themselves to themselves. Anyone else had this sort of problem?