1. Those definitions of agency that take the principal and agent relationship itself as their particular focus: emphasise that that relationship "can only be established by the consent of the principal and the agent".
2. The consents so given need not necessarily be to a relationship that the parties understand, or even accept, to be that of principal and agent. It is sufficient if "they have agreed to what amounts in law to such a relationship"; notwithstanding that they may have "artfully disguised" it by express disclaimers.
3. It is legitimate for parties to avoid the "unwanted consequences" of a particular category of legal relationship by seeking to cast it in a form that takes it outside that category of relationship. But whether or not they are successful in achieving that end does not depend simply upon whether, in an express provision of their agreement, they attribute or deny to their relationship a particular legal character - be this, for example, employer and employee; principal and principal or principal and agent or partners. The parties cannot by the mere device of labelling, no matter how genuinely intentioned, either confer a particular legal character on a relationship that it does not possess or deny it a character that it does possess.
4. Save where an express labelling provision is shown to be a sham, the provision itself (as a manifestation of the parties' intent) must be given its proper weight in relation to the rest of their agreement and such other relevant circumstances as evidence the true character of their relationship. This may lead to its being disregarded entirely; or to its being given full force and effect. And such will depend upon whether, given the actual incidents and content of the relationship (that is, "the factual relation") to which the parties have consented, they have consented "to a state of fact upon which the law imposes the consequences which result from agency".
5. Though there is no uniformly agreed definition of agency; the two whose authoritative character has resulted in their wide citation are those of the Restatement, Second, Agency, s1 and of Bowstead and Reynolds, above, 1-001 (the latter being based upon the Restatement provision). The Restatement's definition is that:
s1 Agency is the fiduciary relation which results from the manifestation of consent by one person to another that the other shall act on his behalf and subject to his control, and consent by the other so to act.
I would note in passing that the definition proposed in the Restatement, Third, Agency, Tentative Draft No 1, s1.01 proposes no material departure from the above. Bowstead and Reynolds' definition is that:
Agency is the fiduciary relationship which exists between two persons, one of whom expressly or impliedly consents that the other should act on his behalf so as to affect his relations with third parties, and the other of whom similarly consents so to act or so acts.
The necessary consents apart, the required characteristics of the relation are that (a) one party acts on the other's behalf, but (b) subject to that other's control or direction.
6. The second of the above characteristics (control or direction) does not appear to figure prominently as a decisive indicator of agency in common law case law save in two settings. The first is where it is contended that a company is an agent of its parent company, shareholders, or of particular officers because of the control it or they exercise over it. Here, and to accommodate the perceived demands of the principle established in Salomon v Salomon & Co that a company is a legal person separate from its parent, officers and shareholders, the control characteristic has had to undergo a degree of refinement which it is not relevant to explore in this proceeding. The second setting in which resort has been had to the control characteristic is where a party that is expressed to stand in the relation of independent contractor to another is claimed as well to be the agent of that other. The two relationships are not mutually exclusive. Though "[c]ontrol by itself is insufficient to establish agency" - the "acting on behalf of" or "representative" characteristic must be able to be discerned in the factual relation of the parties - where that characteristic can properly be inferred in circumstances in which the alleged principal exercises, or is entitled to exercise, a significant degree of control over the contractor's performance of its services (and in particular over contracts entered into), the contractor is apt in consequence to be characterised as an agent. It probably is the case that the control exercisable by one party can in some settings itself bear on the determination whether the other acts on its own account or on behalf of the former when dealing with third parties. (Citations omitted). (My emphasis)[147]