I live in a street with stagered houses. so my house is further back and my neighbour's house is "forward" so my neighbor and i share a wall that joins the houses together. As you come into the front entrance of my property, this wall is on the right side and runs the full length of my front garden. And as you come into the front garden of my neigbour, this wall is on the left and as you walk into my neighbours' house, the left side of the wall is their hallway and kitchen. there is a very clear and straight picket fence starting from where the wall ends. so my neghbour has been jumping over this picket fence and sometimes they have been walking all the way round to my front gate and into my front garden and installing tv dishes on my side of the wall, in my absence. claiming possession of my side of the wall. clearly tresspassing. what are my legal rights?