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The length of time required in order to claim an easement to access based on long use is 20 years. This is called acquiring a right of way by prescription. In order to claim a right in this way you would have to instruct a solicitor to prepare statutory declarations to be executed by you and others who have used the right
These declarations and other supporting evidence form the basis of a subsequent application to Land Registry to register a right of way as an easement and then this would prevent what he was doing because you would then have a legal right of way enforceable against his property.
If he has already restricted access then you should strongly consider speaking with others who are aware of the access being used and seeking with them about perhaps jointly instructing a local property solicitor in order to share legal fees for applying to attempt to have the right registered.
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