xmlns:atom="http://www.w3.org/2005/Atom"
21. It is unlawful for a person —
(a)who has authority over another person; or
(b)in accordance with whose wishes that other person is accustomed to act,
to instruct him to do any act which is unlawful by virtue of any provision contained within regulations 5 to 17 or procure or attempt to procure the doing by him of such an act.