My beach is "private". My walkover is "private". My driveway is "private". As long as you don't use my walkover or driveway to get to my "private" beach you are entitled to "customary" use of my "private" beach. You may walk across it, sit on it, dig in the sand and generally enjoy yourself provided you break no law. I believe this is what "customary" use of the beach means. Also, you may use the walkover or driveway to access my "private" beach with any owner's permission. Is all this fairly transparent?