53.—(1) Except insofar as may be agreed between CMAL and the government department or person concerned or as may be specifically laid down by statue, nothing in any enactment authorising CMAL to levy charges shall extent to authorise them to levy charges on—
(a)a vessel—
(i)belonging to or in the service of Her Majesty or any member of the Royal Family;
(ii)in the service of the Commissioners of H.M Revenue & Customs and not carrying goods for reward;
(iii)in the service of the Commissioners of Northern Lighthouses and not carrying goods for reward; or
(iv)belonging to or used by the lifeboat service whilst employed in or in connection with the functions of that service; or
(b)the Commissioners of H.M Revenue & Customs in respect of a vessel or goods under customs seizure.
(2) Officers of the Department for Transport and of the Scottish Ministers in the execution of their duty shall at all times be exempt from charges in respect of their vessels and otherwise.
(3) This Order shall not extend to subject any person to liability for charges in respect of a vessel which merely passes through the limits of the harbour without mooring or making use of any facilities provided by CMAL.