"It is well-established that a professional engagement may be implied (Allen v. Bone [1841] EngR 1203; (1841) 4 Beav. 493; 49 E.R. 429; Morgan v. Blyth [1891] 1 Ch. 337 at 355; Vroon BV v. Fosters Brewing Group Ltd. [1994] VicRp 53; [1994] 2 V.R. 32 at 83 per Ormiston J.) or inferred (as Tadgell J. preferred to put it, in Toyota Motor Corporation Australia Ltd. v. Ken Morgan Motors Pty. Ltd. [1994] VicRp 55; [1994] 2 V.R. 106 at 178). The question whether a relationship of solicitor and client had been established was considered recently in Pegrum v. Fatharly (1996) 14 W.A.R. 92 by the Full Court of the Supreme Court of Western Australia. Kennedy, Ipp and Anderson JJ. held that such a relationship would be presumed if the conduct of the parties showed that the relevant relationship had, in fact, been established between them. In Integrated Computer Services Pty. Ltd. v. Digital Equipment Corporation (Aust.) Pty. Ltd. (1988) 5 B.P.R. 11, 110 at 11,117, McHugh J.A. said that a contract may be inferred from the acts and conduct of parties as well as or in the absence of their words, but that: The question in this class of case is whether the conduct of the parties as viewed in the light of the surrounding circumstances shows a tacit understanding or agreement. The conduct of the parties, however, must be capable of proving all the essential elements of an expressed contract. See also Groom v. Crocker [1939] 1 K.B. 194 at 222 per Scott L.J. In Pegrum v. Fatharly, to the facts of which I will later, Ipp J. said at 95: A contractual relationship of solicitor and client will therefore be presumed if it is proved that the relationship of solicitor and client existed de facto between a solicitor and another person. Upon proof of that kind it would not be necessary to prove when, where, by whom or in what particular words the agreement of retainer was made... [T]he de facto relationship of solicitor and client has to be a necessary and clear inference from the proved facts before a retainer will be presumed. In this passage, Ipp J. said that he was applying `the rule expressed by Thomas J. in Australian Energy Ltd. v. Lennard Oil NL' [1986] 2 Qd. R. 216 at 237. If the rule as so expressed means no more than that one has to find a necessary inference, on the balance of probabilities, of the kind suggested, I have no difficulty with it. The words used by Ipp J. (and, for that matter, Thomas J.) make use of the established formula for the implication of terms in a contract, and apply that formula to the process by which an agreement is to be inferred. If, in so doing, their Honours were suggesting that a test more stringent than the balance of probabilities was to be used to establish the existence of an inferred or implied retainer, a real question would, with respect, be raised as to whether the test was correctly posed."