6(1)The responsible authority may by notice given to the owner—
(a)consent to specified alterations, or alterations of a specified kind, to a designated structure or feature;
(b)vary or withdraw consent under paragraph (a) (but not retrospectively).
(2)The responsible authority may by notice given to the owner consent to the removal or replacement of a designated structure or feature.
(3)The authority may give notice under sub-paragraph (1) or (2)—
(a)on the application of the owner, or
(b)if it otherwise thinks it appropriate.
(4)Consent may be—
(a)general or specific;
(b)absolute or conditional.
(5)The responsible authority may refuse to give consent applied for under sub-paragraph (3)(a) only on the ground that, in the authority’s opinion, the proposed alteration, removal or replacement would affect a flood risk or a coastal erosion risk.