[F1PART 3AU.K.Maritime enforcement

(1)[F2An English and Welsh constable] may exercise the powers set out in Part 1 of Schedule 4A (“Part 1 powers”) in relation to any of the following in England and Wales waters—

(a)a United Kingdom ship;

(b)a ship without nationality;

(c)a foreign ship;

(d)a ship registered under the law of a relevant territory.

(2)But Part 1 powers may be exercised only—

(a)for the purpose of preventing, detecting, investigating or prosecuting an offence under

[F3(i)section 24B,] 25, [F4or 25A][F5, or

(ii)section 21 of the Immigration, Asylum and Nationality Act 2006, and]

(b)in accordance with the rest of this section.

(3)The authority of the Secretary of State is required before F6... an English and Welsh constable F7... may exercise Part 1 powers in relation to a foreign ship, or a ship registered under the law of a relevant territory, within the territorial sea adjacent to the United Kingdom.

(4)Authority for the purposes of subsection (3) may be given in relation to a foreign ship only if the Convention permits the exercise of Part 1 powers in relation to the ship.]