The council of a county may investigate, where they consider it expedient to do so, any proposals for coast protection works within the county under section 2. On receipt by the Commissioners from the promoting authority, being a council having released a declaration, that the promotion of a coast protection scheme is expedient, of a certified copy of a resolution by the promoting authority for the purposes of paragraph (b) of subsection (1) of section 5 of this Act, the Commissioners may, subje