Dwellings in more than one part of a billing authority’s area
4.—(1) Subject to paragraph (2), where a relevant dwelling falls within two or more parts of a billing authority’s area, it shall be treated for the purposes of Part I of the Act as situated in the part in which the greater or greatest part of the dwelling, determined in accordance with regulation 5, is situated.
(2) Where a relevant dwelling is part of a single property which falls within two or more parts of a billing authority’s area, it shall be treated as situated in the part in which the greater or greatest part of the single property, determined in accordance with regulation 5 is situated.