Discussion
33Section 68 of the Fair Trading Act, as in force at the relevant time, created a right to recover the amount of relevant loss or damage "in a court of competent jurisdiction". The legislature thus entrusted to the judicial branch of government all questions concerning contravention, causation and quantum, making it clear that a court was to determine these matters in the exercise of its judicial function. Necessarily implied were a requirement and a concession that the determination was to be made in accordance with the procedures and principles that govern proceedings in which one person resorts to a court to recover loss or damage and another person has the right to defend the claim.
34Assume the following facts. A client, being of the view that his or her lawyers have acted wrongfully, sues them in a particular court. The client's statement of claim pleads causes of action in damages for breach of a common law duty of care and breach of the contract of retainer. After a trial, there is verdict and judgment for the defendant lawyers. The client then commences fresh proceedings against the lawyers in the same court alleging precisely the same facts but pleading the statutory cause of action based on s 42(1) and s 68 of the Fair Trading Act and claiming recovery of loss or damage suffered by contravention of 42(1).
35In that assumed situation, the defendant lawyers would promptly resort to one (or both) of two allied principles: first, that a party may be estopped from raising a claim which the party could have litigated in a previous proceeding if it was unreasonable for the claim not to have been so litigated; and, second, that a party may not be permitted to misuse or abuse the process of the court by seeking to raise before it an issue that could and should have been raised in a previous proceeding. The preoccupation, in each case, is with ensuring the integrity of the judicial process as a means of producing finality in the quelling of disputes and of doing so efficiently and justly.
36The particular principles represent two central aspects of the judicial function. If the legislature places resolution of a particular species of controversy within the province of a court, it does so in the knowledge and with the expectation that the court will bring to bear the whole of its jurisdiction, including those principles.
37In the assumed circumstances outlined, therefore, there could be no conceivable quarrel with the proposition that the defendant lawyers, when sued a second time, could call in aid the particular aspects of jurisdiction with a view to halting the subsequent action and causing the claim based on the Fair Trading Act provisions to be dismissed without trial.
38In the same way, the principle of finality, as it underlies advocate's immunity, is a part of the court's jurisdiction that relevant defendants may call in aid. Advocates do not enjoy the immunity because they are somehow a deserving group. The concern is not with a right, freedom or immunity of advocates as advocates, whether "fundamental" or of some lesser order. The shield afforded to advocates is no more than a by-product of the court's concern to secure the aspect of justice that is represented by the finality principle and in that way to protect the integrity of the judicial process.
39The power to adjudicate that s 68 of the Fair Trading Act gives to a court of competent jurisdiction is a power to adjudicate in exercise of the court's judicial function and in accordance with the principles of just determination that are part and parcel of the operation of the judicial branch of government. Protection of the finality of litigation through recognition and effectuation of the advocate's immunity from suit is part of the operation of the judicial branch of government.
40The Commonwealth Parliament, when deciding whether to invest State courts with federal jurisdiction, must take those courts as existing judicial organs in the condition in which it finds them: Le Mesurier v Connor [1929] HCA 41; 42 CLR 481. The legislature of a State, when investing the State's courts with particular jurisdiction, will also be regarded as taking those courts as existing judicial organs in the condition in which it finds them unless it clearly specifies otherwise.
41There is nothing in the Fair Trading Act provisions relevant to this case indicating that a court to which the power to determine claims is given should proceed otherwise than in accordance with the general principles of just adjudication administered by it.
42The immunity under discussion is immunity from civil suit. It is not immunity from liability as such. That, coupled with the fact that the immunity has its roots in public policy, means that it is not an absolute immunity. Meadow v General Medical Council [2006] EWCA Civ 1390, [2007] QB 462, a case concerning the allied immunity of witnesses, illustrates the way in which the similar public policy underpinning that immunity may yield to a competing public policy. It was there held that immunity from suit of an expert medical witness in relation to evidence given by him in legal proceedings did not extend to immunity from disciplinary or fitness to practise proceedings. Those proceedings have the purpose of protecting the public by ensuring that persons who are not fit to practise do not do so; and it was regarded as wrong in principle for the court to limit the powers of an inquiry into fitness to practice by extending the immunity from civil suit to such an inquiry.