Halsbury’s Statutes 3rd edition, Volume 36 - Statutes, paragraph 559 page 337 paragraph 12, 12(1);
"the Sovereignty of the parliament of the Original Tribes could not be usurped by the Sovereignty of the Parliament of the UK. This rule applies equally for Pacific jurisdictions.'‘ 559.
Legislative supremacy of Parliament-The legislative authority of the Sovereign in Parliament is supreme (e), A statute, whether public or private (f), can define or override the common law (g), abrogate local custom (h) and amend or repeal the provision of earlier statutes (i). Since, however, every Parliament is supreme, one Parliament cannot derogate from the powers of a subsequent Parliament (k), and it follows that a statute can neither provide that it shall be incapable of repeal (l) nor dictate the form of subsequent legislation (m)’.
12.1 As can be found in (i) of above, [para. 12], New Zealand Parliament cannot derogate from the Sovereign Supremacy of England and England cannot derogate from the Sovereign Supremacy of The Mauri Nation assembled in Parliament at Waitangi and following the principle found in (k) a statute does not need to state that it cannot be repealed because as found in (i) once put into force it cannot be repealed by any later Parliament, its provisions can merely be brought forward into current legislation, because a later Parliament cannot derogate from its forefathers legislation.