If the Secretary of State is satisfied that it is necessary to remedy a substantial injury to the amenity of the locality or a danger to members of the public, he may serve a discontinuance notice under regulation 8 in relation to an advertisement F2displayed by an interested planning authority.

Paragraphs (2), (5) and (6) of regulation 8 shall apply to a discontinuance notice to which paragraph (1) above applies as if references to the local planning authority were references to the Secretary of State.

Paragraph (3) of regulation 15 shall apply to a discontinuance notice to which paragraph (1) above applies, with such modifications as may be necessary.