11.—(1) Anything done by a person in the course of his employment shall be treated for the purposes of these Regulations as also done by his employer, whether or not it was done with the employer’s knowledge or approval.
(2) Anything done by a person as agent for the employer with the authority of the employer shall be treated for the purposes of these Regulations as also done by the employer.
(3) In proceedings under these Regulations against any person in respect of an act alleged to have been done by a worker of his, it shall be a defence for that person to prove that he took such steps as were reasonably practicable to prevent the worker from—
(a)doing that act; or
(b)doing, in the course of his employment, acts of that description.