43.—(1) Where the regulator considers that a person (“P”) has contravened, is contravening, or is likely to contravene a relevant provision, the regulator may serve a notice (“enforcement notice”) on P.
(2) For the purpose of paragraph (1), a “relevant provision” is any provision of—
(a)these Regulations;
(b)the Monitoring and Reporting Regulation;
(c)a permit; or
(d)an aviation emissions plan.
(3) An enforcement notice must—
(a)state the regulator's view under paragraph (1);
(b)specify the matters constituting the contravention or making a contravention likely;
(c)specify the steps that must be taken to remedy the contravention or to ensure that the likely contravention does not occur; and
(d)specify the period within which those steps must be taken.
(4) P must comply with the requirements of the notice within the period so specified.
(5) The regulator may withdraw an enforcement notice at any time by further notice served on P.