the meaning of that Act)" shall be substituted for the words "the Post Office" " work of engineering construction " means the construction, structural alteration, maintenance or repair of any railway line or siding or any dock, harbour, inland navigation, tunnel, bridge, viaduct, waterworks, reservoir, pipeline, aqueduct, sewer, sewage works or gasholder. (2) The area of a local authority which includes part of the seashore shall also include for the purposes of this Part of this Act, except sections 62 to 67, the territorial sea lying seawards from that part of the shore; and --  (b) this Part of this Act (except sections 62 to 67 and this subsection) shall have effect, in relation to any area included in the area of a local authority by virtue of this subsection --  (i) As if references to premises and the occupier of premises included respectively a vessel and the master of a vessel, and (ii) with such other modifications, if any, as are prescribed. (3) Where more than one person is responsible for noise, this Part of this Act shall apply to each of those persons whether or not what any one of them is responsible for would by itself amount to a nuisance, or would result in a level of noise justifying action under this Part of this Act . . . F435 (4) This Part of this Act does not apply to noise caused by aircraft other than model aircraft and does not confer functions on port health authorities.