75 This conclusion was reached despite the lessee's argument that s 20(1)(a) of the TPD Act operated to make the whole of the agreement illegal and void so there was nothing to sever [65]. McKechnie J considered Thomas Brown v Fazal Deen; Electric Acceptance Pty Ltd v Doug Thorley Caravans (Aust) Pty Ltd [1981] VicRp 77; [1981] VR 799; Firman v Gray; South Western Mineral Water Company Ltd v Ashmore [1967] 1 WLR 1110 and Carney v Herbert [1985] AC 301, and appears to have drawn from those authorities the proposition that even if the whole of a contract is illegal and void, that, nevertheless, severance was possible. With respect to his Honour, the passages quoted from the authorities to which reference was made all support the contrary conclusion, namely that where the whole contract is illegal and void, severance is not possible. His Honour referred to the passage in Chitty on Contracts referred to above and to the reasons of Andrews SPJ in Firman v Gray. That case concerned not the illegality of a whole contract, but merely a particular clause, and Andrews SPJ held that the offending part of the clause was ancillary to the main contract and not of such seriousness as to strike down the whole contract (170). Likewise, McPherson J held that the whole contract was not made illegal, and that distinct and lawful promises may be enforceable even if other promises forming part of the same contract are illegal (177, 181). Also, in Electric Acceptance v Doug Thorley, the whole contract was not made illegal and void by a statute; rather there was an illegal promise which was 'so material and important a promise in the whole bargain that there should be inferred an intention not to make a contract which would operate without it' (821). Likewise, in Thomas Brown v Fazal Deen, there were valid and invalid promises in the contract, and in Carney v Herbert, in the passage of Lord Brightman cited by McKechnie J, his Lordship referred to the case of parties entering into a 'lawful contract' where there was 'an ancillary provision' which was illegal.