12.—(1) The Agencies may prepare supplementary plans for the purposes of supplementing any river basin management plan for the Solway Tweed River Basin District.
(2) A plan prepared under sub-paragraph (1) may, for example, relate to—
(a)a particular description of body of water;
(b)a particular catchment or geographical area;
(c)a particular matter relating to, or aspect of, the water environment; or
(d)a particular description of user of water resources.
(3) The Agencies must, in relation to the preparation of a supplementary plan, consult such of the persons referred to in paragraph 8(4) and such other persons likely to be interested in or affected by that plan as they think fit, and must take into account any views expressed by those consulted.