I own the fence on my right hand (if i stand on the road facing the house). My house is end of terrace (on the right side). Between my parking space and next door's parking space there is a small wall (falling down). Who is responsible for this?
As far as I know nobody has to repair/provide a boundary marker anyway. The owner would be liable if it was unsafe and caused injury to somebody but whether or not you have something marking your boundary is up to you (unless you keep a dog which should be kept within your own land by fencing etc).