The binding legal principles established are: (1) Expropriation may lawfully be used to regularise pre-existing unlawful occupation where the primary purpose of the expropriation is to serve a genuine public purpose or public interest as required by section 25 of the Constitution. An ancillary purpose to regularise an unlawful situation does not vitiate an otherwise lawful expropriation. (2) The test for whether expropriation serves a public purpose is whether it benefits the whole population or the local public, not merely the state or government. The provision of electricity infrastructure clearly constitutes such a public purpose. (3) Expropriation decisions are polycentric administrative decisions requiring an equilibrium between competing interests, to which courts must show deference, though they remain subject to judicial review. (4) The procedural fairness requirements under PAJA do not automatically include a right to reply to responses, a right to discovery of all internal documents, or a right to comment on summaries provided to other decision-makers, absent specific statutory provision or compelling circumstances. (5) For administrative action to be reviewable for bias, it must be shown that a reasonable, objective and informed person would reasonably apprehend that the decision-maker (not merely his officials) did not bring an impartial mind to bear. (6) Internal administrative guidelines and processes do not create enforceable procedural rights beyond those required by applicable legislation and constitutional principles. (7) When determining the adequacy of a description of property or rights to be expropriated, the decision must be read together with any diagrams or other documents expressly incorporated by reference.