Unregistered land is land that is not registered with HM Land registry, it does not mean that it does not have an owner and if you wish to purchase the land or discuss something with the owner what can you do?
It is not easy to contact owners of unregistered land as there is no database [...]

Unregistered land is simply land or buildings that have not been registered with HM Land Registry. This means that there is no title plan of the land showing the boundary lines and there is no title register showing the proprietor, this means that the owner will have old fashioned title deeds to prove ownership of [...]