As for notifying any future buyer, it depends on extent. Not sure this qualifies as yet.
Buying a house is guided by the principle of caveat emptor anywau - buyer beware. If their solicitor fails to make enquiries then that is their issue
I don't understand the need to report it and what solution would follow. It only irritates neighbours you have to live by, at least for a period. One way or another you have to cross them in the near future too.
This sounds like a reasonably simple legal question to answer. The fact that a guy...