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Hi, thanks for your enquiry.
As you already had a right of way over the driveway, the owner of it can not then grant any third party any rights which would hinder or obstruct your Right of way. I am sure you do not want to have to take Court proceedings against the driveway owner but it would be wise for you to write to him stating that unless he takes positive action to prevent your right of way from becoming obstructed, then you will have to consider issuing Court proceedings against him.
I hope this sets out the general legal position.