"…it is an issue in the action whether she [that was Ms Wu] was prompted in January 2009. The essential question is whether that issue goes to the central issues in this case, or is an issue which goes to her credibility."
"The first thing is that the court should not order discovery, or interrogatories which are a form of discovery, on matters which would go solely to cross-examination as to credit ……. It would indeed be a impossible situation in my view if discovery had to be given of every document, not relevant to the actual issues in the action, which might open up a line of inquiry for cross examination of the litigant solely as to credit." 17. Neill LJ said this at 672G to H: "
“At first sight there is some force in the argument that documents which may contain material to impugn the credit of one party might well enable the other party to advance his case. So too it can be said that in a case such as the present, where the defendant has access to police records and other material which might be useful for the cross-examination of the plaintiff, fairness requires that the defendant should give discovery of any documents which relate to the ‘characters of the two police officers. I am satisfied, however, that it has been the long-standing practice not to order discovery which is directed solely to credit. It is sufficient to refer to the decision of the Court of Appeal in Kennedy v Dodson[1895] 1 Ch. 334 and to the decision of Walton J in George Ballantine & Son Ltd v F.E.R Dixon & Son Ltd[1974] 1 WLR 1125 . The existence of this limitation on the right to discovery is also recognised in Ord. 26, r.1(4), which is concerned with discovery by means of interrogatories. This paragraph in the following terms: ‘A proposed interrogatory which does not relate to [any matter in question between the applicant and the other party in the cause or matter] shall be disallowed notwithstanding that it might be admissible in oral cross-examination of a witness.’ The reason for this limitation on discovery is plain. Discovery in an action would become gravely oppressive and time-consuming if there were an obligation on a party to disclose any document which might provide material for cross-examination as to his credit-worthiness as a witness. The present practice is a salutary one which helps to keep discovery within reasonable and sensible bounds.”