UK Property Law
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If the land in question is unregistered then you must have been using it continuously for 12 years in order to claim possession of it and be registered as the registered proprietor at the Land Registry
If you have not been using the land as your own for this period of time then you will not be able to make a claim on it. If you wish to make a claim on the land then you should enclose the land with some simply form of partition and tend to the land. I would make sure that you get an independent third party to witness the enclosure and subsequent tending so that they can swear a statutory declaration to that effect later.
You would have to submit form ADV1 to the Land Registry together with sworn statutory declarations regarding how long you have been using the land (from you and others who know of your use) and it may be something over which you should consider taking specific legal advice from a local solicitor to ensure that the application and supporting documentation is drafted correctly.
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