Where this section applies, the enforcing authority shall itself have power, in a case falling within paragraph (a) or (b) of section 78E(1) above, to do what is appropriate by way of remediation to the relevant land or waters.
Subsection (1) above shall not confer power on the enforcing authority to do anything by way of remediation if the authority would, in the particular case, be precluded by section 78YB below from serving a remediation notice requiring that thing to be done.
This section applies in each of the following cases, that is to say—
Subject to section 78E(4) and (5) above, for the purposes of this section, the things which it is appropriate for the enforcing authority to do by way of remediation are—
In this section "the relevant land or waters" means—