Thanks for your question.
He would have to use the land for twenty years in order to acquire a legal right to graze by prescription
He would not be able to claim adverse possession unless he had continuously used the land for either 10 or 12 years depending on whether the land is registered or not and you would be able to object so there is no problem there.
You should consider getting a local solicitor to draw up a statutory declaration for the farmer to swear in front of a solicitor or commissioner for oaths stating that he has not acquired and will not acquire a right to graze on the land. This will suffice for any prospective purchaser of the land.
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