'17. The leading case is Black v Sumitomo . The following propositions may be derived from the judgment of Rix LJ: (1) The requirements in sub-paragraph (3) (a) and (b) are simply about the likely parties to any claim, not its underlying merits and "likely" in this context means "may well"; see paragraphs 71 and 72; (2) Requirement (c) will raise the question of the clarity of the issues which would arise once the litigation has started, without which such clarity it will be difficult to say if the documents now sought would fall within standard disclosure; see paragraph 76; (3) Requirement (d) with its three possible variants constitutes both a jurisdictional threshold and also a set of factors which are required to be considered in more detail when the question of discretion is dealt with; see paragraphs 81 and 82; (4) The jurisdictional threshold is not intended to be a high one and the real question is likely to be the exercise of discretion which will not be much assisted by the simple fact that the jurisdictional threshold is met; see paragraph 73; if it were otherwise, that would tend to suggest that orders would be made much more frequently under this provision than they are; see paragraph 85; (5) The discretion itself is not confined and will depend on all the facts of the case; important considerations will include the nature of the injury or loss complained; the clarity and identification of the issues raised by the complaint; the nature of the documents requested; the relevance of any protocol or pre-action enquiries and the opportunity which the complainant has to make his case without PAD; see paragraph 88; (6) In addition, if there is considerable doubt as to whether the usual disclosure staged would ever be reached, the court can take this into account as affecting discretion; see paragraph 77. This must be a reference to practical or legal obstacles which the putative claim may face; (7) At paragraph 92 Rix LJ stated "unless there is some real evidence of dishonesty or abuse which only early disclosure can properly reveal and which may, in the absence of such disclosure, escape the probing eye of the litigation process and thus possibly all detection, I think that the court should be slow to allow a merely 6 prospective litigant to conduct a review of the documents of another party, replacing focused allegation by a roving inquisition". This observation was made in the context of Rix LJ having found that the complaint in that case was factually and legally "speculative in the extreme" see paragraph 91. Context is important because it is otherwise hard to see why it must be shown that in the absence of early disclosure the evidence would (later) escape the eye of the legal process; (8) The more focused the complaint, and the more limited the disclosure sought in that connection, the easier it is for the court to exercise its discretion in favour of PAD, even where the complaint might seem somewhat speculative or the request argued to be mere fishing. The court might be entitled to take the view that transparency was what the interest of justice and proportionality most required. But the more diffuse the allegations and the wider the disclosure sought more sceptical the court is entitled to be about the merit of the exercise; see paragraph 95. 18. There was a certain amount of debate before me, and in the cases, as to whether it was also necessary for the applicant to show (a) that without the disclosure it could not properly plead a case at all and/or (b) that even without the disclosure, the case had at least a real prospect of success, or had reached some other merits threshold. In fact, of course, there is a degree of tension or inconsistency between those requirements if both had to be made out, as noted in paragraph 28 of the judgment of Underhill LJ in Smith v Energy Secretary[2014] 1 WLR 2283 . Since the view of Rix LJ at paragraph 68 of his judgment was that the provision was addressed to situations where disclosure (a) would help the applicant who could plead a cause of action to improve it or (b) was necessary as a vital step in deciding whether to litigate at all or (c) necessary to provide a vital ingredient in the pleading, it seems to me that questions of underlying merit of the claim should be dealt with in the context of discretion. As Underhill LJ put it in Smith "If there were a jurisdictional requirement of a minimum level of arguability the question would necessarily arise of how the height of the threshold is to be described…It is inherently better that questions about the likelihood of the applicant being able in due course to establish a viable claim are considered as part of a flexible exercise of the court's discretion in the context of the particular case."; see paragraph 24. 19. The potential width and focus of the classes of documents sought is a further matter for discretion. See paragraph 72 of the judgment of Rix LJ. I can see that in an extreme case, where the documents sought were hopelessly wide, that might even militate against the jurisdictional thresholds being achieved. In any event, as Morison J put it in Snowstar v Graig[2003] EWHC 1367 "… Every action for pre-action disclosure should be crafted with great care, so that it is properly limited to what is strictly necessary.". In the case before him where the disclosure sought was "wide and woolly" he did not regard it as a satisfactory suggestion that any flaws in the application notice could be dealt with after judgment. I accept that where the categories of disclosure sought are extremely wide or unclear, the Court is unlikely to be prepared to rescue the application by, in effect, redrafting them. However, in my judgment that does not mean that the Court has no power to adjust the categories of disclosure sought so as to deal with any particular problems, whether in terms of scope or availability, which may become apparent in the course of the application. The extent to which the Court would, as part of its discretion, consider it appropriate to vary the disclosure sought obviously depends on the facts and circumstances of each particular application. See the observations of Marcus Smith J at paragraph 34 of his judgment in Attheraces v Ladbrokes[2017] EWHC 431 .'