(f) the question posed by sub-paragraph (b) of the rule is not whether the applicant has sufficient information to decide if a cause of action is available against the prospective respondent. The question is whether the applicant has sufficient information to make a decision whether to commence proceedings in the Court: Quanta Software at [33] - [34], Alphapharm at [24] - [26]. Accordingly, an applicant for preliminary discovery may be entitled to discovery in order to determine what defences are available to the respondent and the possible strength of those defences, or to determine the extent of the respodent's breach and the likely quantum of any damages award: CGU Insurance Ltd v Malaysia International Shipping Corp Berhad (2001) 187 ALR 279 at [21]; Quanta Software at [33] - [34]; Alphapharm at [24] - [26]; Airservices Australia at [5]".
13 His Honour referred to the recent decision of the Court of Appeal in Tomko v Palasty (No 2) [2007] NSWCA 369 at [52]. It is that process of review that Macready AsJ carried out in respect of the decision of the Registrar. However, the appeal from the Associate Justice to a Judge of this Court, which is what is before me, is an appeal in the true sense of the word and conducted on the same principles as an appeal from a Judge to the Court of Appeal: UCPR r 49.4; Do Carmo v Ford Excavations Pty Ltd [1981] 1 NSWLR 409.
14 An important fact at all stages of this case is that the decision, both of the Registrar and of the Associate Justice on appeal, was a discretionary decision. This upon any review or appeal relating to it brings into play the principles stated in House v The King (1936) 55 CLR 499. This principle is so well known that simple reference to it is often deemed sufficient, but it plays an important part in the decision of this case and it should be set out in full.
"But the judgment complained of, namely, sentence to a term of imprisonment, depends upon the exercise of a judicial discretion by the court imposing it. The manner in which an appeal against an exercise of discretion should be determined is governed by established principles. It is not enough that the judges composing the appellate court consider that, if they had been in the position of the primary judge, they would have taken a different course. It must appear that some error has been made in exercising the discretion. If the judge acts upon a wrong principle, if he allows extraneous or irrelevant matters to guide or affect him, if he mistakes the facts, if he does not take into account some material consideration, then his determination should be reviewed and the appellate court may exercise its own discretion in substitution for his if it has the materials for doing so. It may not appear how the primary judge has reached the result embodied in his order, but, if upon the facts it is unreasonable or plainly unjust, the appellate court may infer that in some way there has been a failure properly to exercise the discretion which the law reposes in the court of first instance. In such a case, although the nature of the error may not be discoverable, the exercise of the discretion is reviewed on the ground that a substantial wrong has in fact occurred."
15 I should add that preliminary discovery has been submitted, correctly in my view, to be a matter of practice and procedure rather than a matter of substance. The distinction was adverted to in the High Court in Adam P Brown Male Fashions Pty Ltd v Phillip Morris Inc (1981) 148 CLR 170 at 176 where their Honours said:
"The essence of such a matter is described in terms which are sufficient for present purposes in Salmond on Jurisprudence 10th ed (1947), P476:
'Substantive law is concerned with the ends which the administration of justice seeks; procedural law deals with the means and instruments by which those ends are to be attained. The latter regulates the conduct and relations of courts and litigants in respect of the litigation itself; the former determines their conduct and relations in respect of the matters litigated'."
16 That pursuant to this test matters relating to preliminary discovery are to be treated as procedural appears from the decision of Powell J in Re Dernacourt Investments Pty Ltd (1990) 20 NSWLR 588 and the decision of the Federal Court in Apache Northwest Pty Ltd v Newcrest Mining Ltd [2009] FCAFC 39.
17 The effect on the approach to the matter arising from the fact that it is a decision on practice and procedure rather than substantive law was dealt with as follows by Hodgson JA in Tomko supra as follows:
"[7] In my opinion, this discretion extends to a discretion as to whether, and if so how, to intervene; and in my opinion, there is an onus on a person seeking to have a court set aside or vary a registrar's decision to make out a case that the court, in the interests of justice, should exercise its discretion to do so.