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A rental house we own shares a driveway with a private dwelling. The owners of that house paid to have the drive replaced with stone and a new wall built to their property some time ago. They are trying to sell their house and advertised it as having a private drive. We told the estate agent it was a shared drive. They then demanded thousands of pounds for the drive upgrading ( which was cosmetic and not the repair/replacement included as a shared responsibility in the deeds) far in excess of any actual costs and blocked access across the driveway. They now plan to put a fence down the boundary line between the properties blocking all vehicle access to the rental house