Boundary dispute

Section62

https://forums.moneysavingexpert.com/discussion/comment/82111953#Comment_82111953

I would also advise OP to take lots of photos and videos of the boundary now with measurements and markers as a reference for when the newbie
does anything as most of these works will be done when the OP is out and will only notice after the event.

This is a good idea, but if the OP is willing to spend money to keep the boundary where it is (e.g. take legal action, if necessary) then it would also be worth investing in a professional survey of the boundary. The new neighbour could challenge the accuracy of the OP's own measurements, whereas a professional survey is likely to carry greater weight and/or the surveyor could be called as an expert witness in extremis.

Ideally measurements should be taken from permanent features, and preferably triangulated (measured from two separate points). Markers (like pegs or stakes) can be moved fairly easily, so are less reliable than something permanent like a building or large tree.

Although the first thing to do - after taking some initial photos of the boundary - would be to talk to the existing owner/vendor to get their side of the story. There's no point paying money for a survey or legal advice if the existing owner is willing to confirm the current boundary is correct and/or the potential sale is likely to fall through.

FreeBear

I would also advise OP to take lots of photos and videos of the boundary now with measurements and markers as a reference for when the newbie does anything as most of these works will be done when the OP is out and will only notice after the event.

Place some substantial markers a set distance away from the disputed border (say 3 or 4 metres). Anything placed on the current boundary is likely to be removed should the (potential) buyer replace the fence.

WIAWSNB

I'd still like to know what the Tuesday really believes.