Thanks for your question.
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.
Thanks for the kind accept.
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