Boundary Disputes are, sadly, becoming more common, and, increasingly, more contentious as adjoining owners adopt entrenched opinions about the rights and wrongs of their beliefs. It is sometimes possible to diplomatically engineer an agreement by being seen to be impartial, albeit that one of the parties to the disagreement will usually have given the instruction to act, independently of the other. However, there are rarely simple remedies, as some of the early Neighbours at War programmes showed all too well !
For more complex disputes, we are personally acquainted with a Chartered Surveyor whose principal activity is dealing with boundary-disputes, whose firm also has the state-of-the-art equipment and expertise for all types of land surveying which we cannot handle.