Good Morning Amanda - I am sorry to read of the issues you are facing
We can't and don't mediate or help resolve a dispute over boundaries. Information held by HM Land Registry may not assist in solving boundary problems and we cannot provide legal advice in relation to boundary disputes or any other matters.
Title deeds hardly ever identify legal boundaries. As a result, the title plan will show you the 'general boundaries' of the property only. In other words, we show the general extent of the property - by a red line on the plan of the registered title without making detailed enquiries as to the exact location of the legal boundaries.
You cannot use the plan to establish the position of a precise legal boundary.
We reflect what we think is a reasonable interpretation of the land in the pre-registration deeds in relation to the detail on Ordnance Survey mapping.
The best way to deal with any dispute is to try to reach an agreement with your neighbour. If that isn't possible, then you should take legal advice on what options might be open to you.
HM Land Registry has produced a series of YouTube videos to answer some of the most common boundary questions, these include:
Further information can also be found on the HM Land Registry website: Your property boundaries.
RICS provide a resolution service but as with all things it very much relies on both parties agreeing to the process/outcome.