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In order to claim an express right of way over the land you must have been using the land and right of way continuously for 20 years: Prescription Act 1832. If you have then you can claim a legal easement over your neighbour's land (ie. a right of way).
You may seek to have this noted on your registered legal title at the Land Registry and I would speak to a local solicitor about making an application to the LR in this regards. It will make the property a little more marketable and avoid an awkward pre-contract enquiry by any buyer you would choose to sell to in the future.
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You already have the right if you have used it for the requisite period of time. If he bars access you can just seek to enforce it by a solicitor in an application to the land registry.
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