We have had a fence dividing our property and our neighbours for the last 15 years aprox. since we sold the site next to us. The wording in the legal documents leaves it a bit vague as to where the boundary line actually is. When the fence was put up, 15 years ago, in order to make it straighter there was gain and loss by both parties along the line, but only by small amounts. The neighbours property has since been sold and the new neighbour wants to replace the existing fence with a new wall. The fence needs replacing so I have no problem with that. But she is making a bit of a fuss about where the boundary line actually is, and where this wall should be!
My question is, if after this long a period of time can someone attempt to change the boundary line? If she does, do I have to go to the expense of a solicitor to stop any change?