11. If a justice of the peace, on sworn complaint in writing, is satisfied that there is reasonable ground for entry into any land or premises by an official veterinary surgeon or authorised officer pursuant to regulation 8 for any of the purposes specified in regulation 7 and either –
(a)that entry has been refused, or a refusal is reasonably expected, and that the official veterinary surgeon or authorised officer has given notice of his intention to apply for an entry warrant to the occupier; or
(b)that a request for entry, or the giving of such a notice, would defeat the object of entry, or that entry is urgently required, or that the land or premises are unoccupied, or the occupier is temporarily absent, and it would defeat the object of entry to await his return,
the justice of the peace may by warrant signed by him, and valid for one month, authorise the official veterinary surgeon or authorised officer to enter the land or premises, if need be by reasonable force.