(1)The authority of the Secretary of State is required before a law enforcement officer exercises any of the maritime enforcement powers, in reliance on section 84(1), in relation to a United Kingdom ship in foreign waters.
(2)The Secretary of State may give authority under subsection (1) only if the State, or the relevant territory, in whose waters the powers would be exercised consents to the exercise of the powers.
(3)The authority of the Secretary of State is required before a law enforcement officer exercises any of the maritime enforcement powers, in reliance on section 84(1), in relation to a foreign ship, or a ship registered under the law of a relevant territory, within the territorial sea adjacent to England and Wales or in international waters.
(4)The Secretary of State may give authority under subsection (3) in relation to a foreign ship only if—
(a)the home state has requested the assistance of the United Kingdom for the purpose of preventing, detecting, investigating or prosecuting an offence under the law of England and Wales,
(b)the home state has authorised the United Kingdom to act for that purpose, or
(c)the United Nations Convention on the Law of the Sea 1982 (Cmnd 8941) otherwise permits the exercise of the powers in relation to the ship.