27. The enforcing authority may, by a notice served on any person, require that person to furnish such information as is specified in the notice, in such form and within such period following service of the notice or at such time as is so specified.
28. If the enforcing authority is of the opinion that a person has contravened, is contravening or is likely to contravene the restriction in regulation 3, the enforcing authority may serve on him an enforcement notice.
29. An enforcement notice shall—
(a)state that the enforcing authority is of that opinion;
(b)specify the matters constituting the contravention or the matters making it likely that the contravention will arise, as the case may be;
(c)specify the steps that must be taken to remedy the contravention or to remedy the matters making it likely that the contravention will arise, as the case may be; and
(d)specify the period within which those steps must be taken.
30. The enforcing authority may withdraw an enforcement notice at any time.
31. If the enforcing authority is of the opinion that the activities of a person, in relation to his contravention or likely contravention of the restriction in regulation 3, are such that they involve an imminent danger of serious pollution of the environment, it may serve on him a prohibition notice.
32. A prohibition notice shall—
(a)state that the enforcing authority is of that opinion;
(b)specify the danger involved in the activity; and
(c)specify the steps that must be taken to remove it and the period within which they must be taken.
33. The enforcing authority may withdraw a prohibition notice at any time.
34. If a person fails to comply with an enforcement notice or prohibition notice, the enforcing authority may do what that person was required to do and may recover from him any expenses reasonably incurred in doing so.