8.—(1) No person shall —
(a)without the permission of the occupier, enter —
(i)any store in or at a site;
(ii)any building used for the manufacture of explosives in or at a site, or
(iii)any site with clearly marked boundaries at which explosives are stored or manufactured,
operating under a licence or registration; or
(b)having so entered, refuse to leave that site when requested to do so by a constable or the occupier, his employee or agent.
(2) Where following a request referred to in paragraph (1)(b) the person who has entered that place without permission refuses to leave that site, a constable or the occupier, his employee or agent may remove that person from the site using reasonable force, if necessary.
(3) “Enter” for the purposes of this regulation, includes entering onto a roof of a store or a building in which explosives are manufactured.