1. Dear *****, the only way to resolve this dispute without litigation is to have a survey carried by a member of the Royal Institute of Chartered Surveyors to determine where the true boundary line lies. Depending on the survey, you will both then know where the true boundary lies and there will then be no dispute. So, you should first suggest to your neighbour that you agree to have this survey carried out jointly so that the true boundary can be determined, sharing costs jointly. If your neighbour will not agree to this course of action, then you can get one done yourself and send it to your neighbour when you receive it. In this way, the dispute over the boundary can be resolved. Here is a link to the page of the RICS which deals with boundary disputes www.rics.org//es/tag/boundary-disputes/. You can follow the link at the foot of the page to find a surveyor working near you who can carry out the survey. Be aware that the survey will be highly accurate to micro- millimetres.
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My name is ***** ***** I have been a solicitor for more than 35 years
If the property is still owned by the council then the problem is for the council to sort out.
You can download copies of the Land Registry plans and deeds using the portal here
One of the deeds may include measurements which would help.