There shall be included in an authorisation—
but no conditions shall be imposed for the purpose only of securing the health of persons at work (within the meaning of Part I of the Health and Safety at Work etc. Act 1974).
Those objectives are—
Except as respects the general condition implied by subsection (4) below, the Secretary of State may give directions to the enforcing authorities as to the conditions which are, or are not, to be included in all authorisations, in authorisations of any specified description or in any particular authorisation.
Subject to subsections (5) and (6) below, there is implied in every authorisation a general condition that, in carrying on the process to which the authorisation applies, the person carrying it on must use the best available techniques not entailing excessive cost—
In the application of subsections (1) to (4) above to authorisations granted by a local enforcing authority references to the release of substances into any environmental medium are to be read as references to the release of substances into the air.
The obligation implied by virtue of subsection (4) above shall not apply in relation to any aspect of the process in question which is regulated by a condition imposed under subsection (1) above.
The objectives referred to in subsection (2) above shall, where the process—
include the objective of ensuring that the best available techniques not entailing excessive cost will be used for minimising the pollution which may be caused to the environment taken as a whole by the releases having regard to the best practicable environmental option available as respects the substances which may be released.
An authorisation for carrying on a prescribed process may, without prejudice to the generality of subsection (1) above, include conditions—
This section has effect subject to section 28 below . . .
References to the best available techniques not entailing excessive cost, in relation to a process, include (in addition to references to any technical means and technology) references to the number, qualifications, training and supervision of persons employed in the process and the design, construction, lay-out and maintenance of the buildings in which it is carried on.
It shall be the duty of enforcing authorities to have regard to any guidance issued to them by the Secretary of State for the purposes of the application of subsections (2) and (7) above as to the techniques and environmental options that are appropriate for any description of prescribed process.
In subsection (2) above "the relevant enactments" are any enactments or instruments contained in or made for the time being under—