84(1)
Part I of this Act does not apply to any aerodrome in the occupation of a government department but, subject to that, references in that Part and in Part II of this act to public works and responsible authorities include references to any works or authority which, apart from any Crown exemption, would be public works or a responsible authority.
84(2)
Parts III and IV of this Act apply in relation to the acquisition of interests in land (whether compulsorily or by agreement) by government departments being authorities possessing compulsory purchase powers, as they apply in relation to the acquisition of interests in land by such authorities who are not government departments.