5.—(1) Subject to paragraph (2) below, the enforcing authority shall, at the same time as it serves a remediation notice, send a copy of it to each of the following persons, not being a person on whom the notice is to be served—
(a)any person who was required to be consulted under section 78G(3) before service of the notice;
(b)any person who was required to be consulted under section 78H(1) before service of the notice;
(c)where the local authority is the enforcing authority, the Environment Agency; and
(d)where the Environment Agency is the enforcing authority, the local authority in whose area the contaminated land in question is situated.
(2) Where it appears to the enforcing authority that the contaminated land in question is in such a condition by reason of substances in, on or under it that there is imminent danger of serious harm, or serious pollution of controlled waters, being caused, the enforcing authority shall send any copies of the notice pursuant to paragraph (1) above as soon as practicable after service of the notice.