The binding legal principles established are: (1) Under section 14(1) of LUPO, determining the 'utilisation' of land as at the relevant date is a purely factual enquiry that does not permit speculation or inference without evidential foundation; it requires actual evidence of how the specific land was being used, not assumptions based on surrounding land use. (2) Administrative decisions vitiated by being based on false, speculative or hypothetical information, even if provided innocently by officials, are reviewable and must be set aside - the administrator's discretion must be exercised on a correct factual basis. (3) An administrative decision fails the rationality test under PAJA section 6(2)(f)(ii)(cc) where there is no rational objective basis justifying the connection between the material available and the conclusion reached. (4) Where an administrative decision is so unreasonable that no reasonable person could have made it (PAJA s6(2)(h)), it may be set aside as 'perverse', 'utterly irrational' or 'outrageous in its defiance of logic'. (5) Courts may substitute their own decision for that of an administrator under PAJA section 8(1)(c)(ii) in 'exceptional cases', including where only one proper decision is possible on the available material and remittal would serve no useful purpose and cause unnecessary delay.