Zones and agglomerations
4.—(1) The Welsh Ministers must, for the purposes of these Regulations, divide the territory of Wales into zones and agglomerations.
(2) A zone will be classified as an agglomeration if it is a conurbation with a population in excess of 250,000 inhabitants.
(3) In these Regulations references to a zone include a zone which has been classified as an agglomeration.