Precedents and Authorities Cited and Their Influence
Order 31, Rule 12 RSC (Inter Partes Discovery)
The Court emphasised strict compliance with O.31 r.12 for inter partes discovery:
a valid application requires a prior voluntary discovery request specifying categories, reasons, and, for ESI, whether searchable form is sought. The judge cited Sheehy & McAuley v Government of Ireland (Kelly J) and Swords v Western Proteins (Morris P) to stress the post-1999 “pinpointing” regime—blanket discovery is “a thing of the past.”
Relevance (Peruvian Guano; Ryanair v Aer Rianta)
The classic Peruvian Guano test, adopted by the Supreme Court in Ryanair v Aer Rianta, remains the touchstone: documents are relevant if they would be evidence on any issue or might lead to a train of inquiry to advance the applicant’s case or damage the opponent’s.
Necessity and Proportionality (Tobin v Minister for Defence; Dome Telecom; AstraZeneca)
The Court reiterated that even where relevance is shown, discovery is ordered only if necessary for the fair disposal of the case or to save costs, and if proportionate. Clarke CJ in Tobin consolidated proportionality as a controlling criterion; Dome Telecom and AstraZeneca underscore the need to weigh the expected evidential utility against the burdens and costs of discovery.
Fishing Expeditions (Aquatechnologie; Lombard v Kevin Devlin Transport)
Murray J’s warning in Aquatechnologie that discovery cannot be speculative was invoked. Donnelly J’s observations in Lombard reinforce that discovery aids the progress of existing litigation; it is not a device to find or construct a case after issuing proceedings.
Order 31, Rule 29 RSC (Non-Party Discovery); Chambers v Times; Fusco v O’Dea
The Court confirmed the stringent, discretionary nature of non-party discovery. Per Chambers v Times, courts should be slow to burden non-parties where a realistic alternative exists, and such orders are reserved for when the documents are not otherwise readily available. Fusco v O’Dea affirms the discretionary character of third-party discovery. The Court also referenced its own recent summary in O’Sullivan v AIB [2025] IEHC 487: before pursuing non-party discovery, a party must exhaust other routes (including inter partes discovery and proffered access).
Order 76 RSC and Practice Direction HC86 (Access to Court Files)
Order 76 r.64 applies the O.31 discovery regime to bankruptcy proceedings, “as far as practicable.” PD HC86, issued following Michael and Thomas Butler Ltd v Bosod Ltd [2018] IEHC 702 (Kelly P), safeguards the integrity of Superior Court files by prohibiting physical file access (even to parties), while permitting copies on payment of fees. The Court held that applicants must use PD HC86 and related mechanisms before seeking discovery orders for court-held files.
Costs and Bankrupt Litigants (Bank of Ireland v O’Donnell)
O’Donnell J’s remarks highlight judicial caution where litigants may not be subject to ordinary costs discipline. This informed the proportionality analysis and the Court’s reluctance to impose wide and costly discovery burdens where cost recovery may be doubtful.