5. In regulation 4 two hereditaments are contiguous if—
(a)some or all of a wall, fence, or other means of enclosure of one hereditament forms all or part of a wall, fence, or other means of enclosure of the other hereditament, or
(b)the hereditaments are on consecutive storeys of a building and some or all of the floor of one hereditament lies directly above all or part of the ceiling of the other hereditament,
and hereditaments occupied or owned by the same person are not prevented from being contiguous under paragraph (a) or (b) merely because there is a space between them that is not occupied or owned by that person.