Again their Honours presented themselves with the opportunity of saying that the definition applied to paragraphs (b) and (c), but declined to do so.
31 In my respectful opinion everything that their Honours said showed that they were relating the definition of relevance in sub-rule 1(d) to sub-rule 3(3)(a). They were fully aware that his Honour had treated sub-rules (3)(b) and (c) differently. They made no criticism of that and, in my opinion, far from their reasoning supporting the submissions made by Mr Walker, it supports the view that rule 1(d) has no relevance to sub-rules (3)(b) and (c). Further, their Honours were aware that his Honour had referred to the principle stated in Mulley v Manifold. It is so well known and so frequently applied in this area of discourse, that I cannot conceive that if their Honours were over-ruling it, at least for all purposes, they would not have said so. They made no reference to it. Nor did they offer any criticism of my statement in Lakatoi, which, of course, was made in the context of the rules.
32 It is also important, in my respectful opinion, to note that Mason P and Priestley JA appear to have come to a different conclusion on this point to that of Fitzgerald JA. In paragraph 27 his Honour said:-
"The majority consider that the Judge" (Einstein J) "correctly decided that any document in either class is relevant within the meaning of the discovery rules and that no limitation on the documents in the two classes was intended or needed. I doubt whether that is correct."
33 It seems to me, therefore, that there may be some difference between the views of Mason P and Priestley JA, on the one hand, and Fitzgerald JA, on the other, as to the extent to which the definition applied. If there was, this pointed up more clearly that the majority was only applying the relevance definition to rule 3(3)(a). Alternatively, it may be that there was no difference in relation to the rules, but rather their application to the particular facts of that case. However that may be, the situation remains that in my opinion Mason P and Priestley JA made it very clear that sub-rule 1(d) only applied to rule 3(3)(a) and not to sub-rules (b) and (c).
34 The reason for this, if I may say so with respect, is not difficult to understand. It is, in part, concerned with the reason for the amendment to the rules in 1996. Whilst their Honours were of the view that the new rules were intended to exclude the "train of inquiry" idea as a factor in deciding relevance, which may well be correct, they were also intended to curb the perceived excesses of general discovery, which, from my experience as a trial Judge sitting in Commercial causes, was causing concern. Thus the Court was given new powers to control discovery, but in the context, obviously enough, of achieving the basic end to which discovery was aimed, namely ensuring that all relevant facts in issue could be explored properly so that there could be a judicial determination based upon that exercise, which would preclude any injustice by reason of a party's being denied access to relevant admissible evidence. In many cases the existence of certain of that evidence will only arise from following a train of inquiry. It cannot have been the purpose of the rules to preclude a litigant from doing that and thereby being deprived of the opportunity to present his case and, as I have sought to explain, such a right is not destroyed by the definition.
35 In these circumstances rule 3 provided that the Court may order discovery of documents within a class or classes specified in the order; that the class should not be specified in more general terms than the Court considers justified in the circumstances; and that the class may be specified by reference to one or more of the categories appearing in sub-rule (3). This gave the Court the necessary power to control discovery and thus the perceived excesses that general discovery was causing. It was not disputed before me that sub-sub-rules (a), (b) and (c) are disjunctive, nor, in my opinion, could it have been. Three separate categories are specified. The only reference to "relevance" is in sub-rule (a) and, if the Court orders discovery conformably with that provision, the test of relevance in rule 1(d) must be met although, as I have said, it would not necessarily, and it was not submitted that it would necessarily, preclude the discovery of a document, which disclosed a train of inquiry. The other two sub-rules make clear that the Court retains the power, depending upon the case, its particular circumstances, and the issues raised, to order wider discovery, albeit related to the facts in issue. Einstein J made this clear and, as I have said, the Court of Appeal offered no criticism of that part of his reasons, nor of the passage from my judgment. There may be cases where it is totally appropriate to make an order which picks up the train of inquiry "idea", e.g. cases where the facts are essentially within the knowledge of the other party. However, it is not necessary for present purposes to explore those possibilities. Suffice it is to say that it would be extraordinary, in my view, if the power of the Court in relation to paragraphs (b) and (c), which is given in wide terms, was to be circumscribed by the reference back to the definition of relevance. This would be self-evidently so if any such confining led to the wholly unjust result that a party may be deprived of material which would enable him to use admissible evidence to seek to prove his case. The whole purpose of the amendments was to give the Court both greater control of the discovery process and an amplitude of power to make orders appropriate to the particular circumstances of a given case. No part of the purpose was to allow a situation of injustice to arise. Detailed provisions are made for the way in which discovery is to be given, the list of documents being required to comprise "all the documents .. specified in the order (other than excluded documents)": rule 3(5)(a).
36 Part 23 rule 4 provides that the Court may inspect documents to determine any question of privilege or any other question arising from the operation of the Part. Therefore, the Court is given the express power to consider documents and the party to whom discovery has been given is no longer necessarily bound by the oath of the discovering party.
37 Finally, it seems to me that if the Court of Appeal had intended that the statement of Menzies J in Mulley v Manifold was no longer to apply by virtue of the terms of the rule, their Honours would have said so. They would be fully aware of the extent to which reliance has been placed upon that decision for over forty years and, I have no doubt, in guiding Judges at first instance, they would have said if that test no longer had any application to any part of the rules.
38 In the circumstances I reject Mr Walker's submission that rule 1(d) applies other than to rule 3(3)(a) and, in any event, I accept his concession, which I think was made correctly, that a document which is otherwise discoverable as being relevant may, none-the-less, be one which gives rise to a train of inquiry. I do not understand the Court of Appeal to be saying anything different in Idoport. Rather, as I have sought to explain, the majority was restricting the basis of relevance to documents relevant for reasons stated, which did not include, but may none-the-less pick up, the train of inquiry concept. In the result, I propose to review my reasons on the basis that the definition of relevance does not apply to categories of documents, where the order has been to discover documents within categories.
39 Further, I propose to consider whether the documents are shown to be relevant in any event and the reference to train of inquiry, although put in what, with the benefit of hindsight, may seem to have an incorrect way, was none-the-less justified.
40 On this occasion I also propose to make orders, so that if there is any disagreement with my reasons, which the defendants wish to test, the matter can be the subject of an application for leave to appeal to the Court of Appeal. It seems to me that the question of how discovery should be ordered is far too important, in the general administration of cases at first instance, to be left in any area of doubt. I do not suggest that the doubt stems from the decision in Idoport, but rather from the conflicting submissions made in relation to the rules. If, as Mr Walker suggested, rule 1(d) is reflective of a compromise it may be that the Rule Committee should reconsider the rule with a view to clarifying it. Any such clarification would be assisted by the consideration of the Court of Appeal of these reasons in the light of the decision in Idoport.