(1)Any reference in this Act to a pilotage district in which pilotage is compulsory shall, in the case of a district in which pilotage is compulsory only in part of the district, be construed, if the context so requires, as a reference to that part of the district only.
(2)Subsection (1) above shall cease to have effect on such day as the Secretary of State may by order appoint; and different days may be appointed under this subsection for different purposes.