18.—(1) Subject to paragraph (2), the Health and Safety Executive may, by a certificate in writing, exempt any person or class of persons or any dangerous substance or class of dangerous substances from all or any of the requirements or prohibitions imposed by these Regulations and any such exemption may be granted subject to conditions and to a limit of time and may be revoked at any time by a certificate in writing.
(2) The Executive shall not grant any such exemption unless, having regard to the circumstance of the case, and in particular to–
(a)the conditions, if any, which it proposes to attach to the exemption; and
(b)any other requirements imposed by or under any enactments which apply to the case,
it is satisfied that the health and safety of persons who are likely to be affected by the exemption will not be prejudiced in consequence of it.