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If the land in question is owned by you, then your neighbour is certainly not legally entitled to park on it, UNLESS his Deeds give him a right to park on the land.
I must say that it would be most unusual for the Deeds to grant a neighbour a right to park on a third party's land where th eland is a shared access.
Although it is quite easy for me to spout the law, in practice, it is a lot harder for you to resolve the issue.
The only remedy available for you would be to issue Court proceedings against him, with a view to obtaining an Injunction to stop him parking there.
I would t
re suggest that you send him a letter, confirming that you have taken legal advice and that unless he stops parking there, you will have no alternative but to instruct a SOlicitor with a view to issuing Court proceedings against him, and that he will be liable for any legal costs incurred by you in issuing such proceedings.
Hopefully, this will then do the trick!
I hope this helps and sets out the legal position to you.