(1) A person employed, in respect of whom an employment medical adviser or an appointed doctor has, to the knowledge of the occupier or his agent, by signed and dated entry in the health register recorded his opinion that the continued employment of that person in work as a classified worker or in total enclosures, active areas, decontamination areas, radiation areas or tracer areas would involve special danger to his health, shall not be employed in any such work unless that entry has been cancelled by a further entry made by an employment medical adviser or an appointed doctor, and no person shall perform any such work while it is to his knowledge unlawful under this paragraph for him to be employed in such work.
(2) The occupier shall forthwith notify the inspector for the district of the making of any entry by an employment medical adviser or an appointed doctor recording his opinion as aforesaid.