4.—(1) For the purposes of the enforcement of this Order or any equivalent Order, a British sea fishery officer may exercise the powers conferred by this article in relation to–
(a)any Scottish fishing boat wherever it may be; and
(b)any relevant British fishing boat within the Scottish zone.
(2) A British sea fishery officer may go on board the boat, with or without persons assigned to assist that officer in the duties of that officer, and for that purpose may require the boat to stop and do anything else which will facilitate the boarding of the boat.
(3) A British sea fishery officer may require the attendance of the master and other persons on board the boat and may make any examination and inquiry which appears to that officer to be necessary for the purpose of enforcing this Order or any equivalent Order and, in particular–
(a)may examine any fish on the boat and the equipment of the boat, including the fishing gear, and require any person on board the boat to do anything which appears to that officer to be necessary for facilitating the examination;
(b)may require any person on board the boat to produce any document in the custody of that person relating to the boat, to any fishing operations ancillary thereto or to the persons on board;
(c)may take copies of any such document;
(d)for the purpose of ascertaining whether the master, owner or charterer of the boat has committed an offence under section 3(5) of the Sea Fish (Conservation) Act 1967 as read with this Order or any equivalent Order, may search the boat for any such document and may require any person on board the boat to do anything which appears to that officer to be necessary for facilitating the search; and
(e)where the boat is one in relation to which that officer has reason to suspect that such an offence has been committed, may seize and detain any such document produced to that officer or found on board, for the purpose of enabling the document to be used as evidence in proceedings for that offence,
but nothing in sub-paragraph (d) above shall permit any document required by law to be carried on board the boat to be seized and detained except while the boat is detained in a port.
(4) Where it appears to a British sea-fishery officer that a contravention of any provision of this Order or any equivalent Order has at any time taken place within British fishery limits, that officer may–
(a)require the master of the boat in relation to which the contravention took place to take (or that officer may take) the boat and its crew to the port which appears to that officer to be the nearest convenient port; and
(b)detain or require the master to detain the boat in that port,
and where such an officer detains or requires the detention of a boat, that officer shall serve on the master a notice in writing stating that the boat will be or is required to be detained until that notice is withdrawn by the service on the master of a further notice in writing signed by a British sea fishery officer.