The carrying out of any works under this Act shall not be deemed for the purposes of the [S.I. 1988/1813.] Town and Country Planning General Development Order 1988 (or any general order superseding that order made under section 59 of the [1990 c. 8.] Town and Country Planning Act 1990, or any corresponding provision of an Act repealing that section), to be—
(a)development authorised by an Act which designates specifically both the nature of the development and the land upon which it may be carried out; or
(b)development by dock, pier or harbour undertakers or their lessees of operational land of the undertaking being development which is required for the purpose of shipping or in connection with the embarking, disembarking, loading, discharging or transport of passengers or goods at a dock, pier or harbour.