5.—(1) Regulations 6 to 13 shall have effect with a view to protecting persons against a risk to their health, whether immediate or delayed, arising from exposure to substances hazardous to health except—
(a)where and to the extent that the following Regulations apply, namely—
(i)the Coal Mines (Respirable Dust) Regulations 1975(1),
(ii)the Control of Lead at Work Regulations 2002(2),
(iii)the Control of Asbestos at Work Regulations 2002(3);
(b)where the substance is hazardous to health solely by virtue of its radioactive, explosive or flammable properties, or solely because it is at a high or low temperature or a high pressure;
(c)where the risk to health is a risk to the health of a person to whom the substance is administered in the course of his medical treatment.
(2) In paragraph (1)(c) “medical treatment” means medical or dental examination or treatment which is conducted by, or under the direction of a—
(a)registered medical practitioner;
(b)registered dentist; or
(c)other person who is an appropriate practitioner for the purposes of section 58 of the Medicines Act 1968(4),
and includes any such examination or treatment conducted for the purpose of research.