Article 21 Boarding of vessels
Any duly authorised officer of the Commissioners may, on producing if so required that officer’s authority, enter and inspect a vessel in the harbour—
(a)
for the purposes (including the enforcement) of any enactment relating to the Commissioners or of any byelaw of the Commissioners or any general or special direction,; or
(b)
to prevent or extinguish fire;
but, except in an emergency, no entry shall be made under this article without notice first having been given to the owner or the person appearing to have charge of the vessel; and the notice shall have annexed to it a copy of this article.