The BP Refinery fivefold test for implied terms need not be applied in full rigour to informal contractual arrangements not encapsulated in a formal detailed document; instead, inquiries such as whether the term is 'reasonable', 'necessary to give business efficacy', or 'so obvious that it goes without saying' serve as helpful guides. A person engaged for the first time in a single transaction who does not intend to engage in subsequent similar transactions is not an 'estate agent' within the meaning of s 4 of the Estate Agents Act 1980 (Vic) and is not barred from recovering commission by s 50.
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