Anonymized Summary of High Court Judgment (Judge Kennedy)

Factual and Procedural Background

This judgment, delivered by Judge Kennedy on 12 September 2025, concerns discovery applications made by Company C (joined to the main action as a notice party and also a defendant to a counterclaim) against the Plaintiffs and Company A under Order 31 rule 12 (Inter Partes Discovery) of the Rules of the Superior Courts ("RSC"). The central litigation ("the Substantive Proceedings") is a private law action brought by the Plaintiffs against Company A (and later Company B) concerning whether a 2014 loan restructuring agreement required Company A to release registered charges over certain development units so that those units could be sold. The Plaintiffs sold 14 units; Company C acquired title to all 14 units and is the registered owner of four units in dispute ("the Four Units"). Company A contends it agreed only to the sale/release of ten units and not the Four Units; the Plaintiffs contend Company A agreed to release charges on all 14 units.

Company B later acquired Company A's loan and security interests in January 2020 and was added as a defendant in the Substantive Proceedings. Company B also brought a counterclaim against the Plaintiffs and Company C seeking to set aside the transfer of the Four Units and claiming judgment and ancillary reliefs. Company C had been joined to the Substantive Proceedings as a notice party (with its consent) on an application made by the Plaintiffs. Company C then sought discovery from the Plaintiffs and Company A: the discovery requests were framed in terms of Order 31 rule 12 (inter partes discovery) and sought material said to evidence any agreement about release of the charges and related enforcement correspondence. Company A and the Plaintiffs objected, contending that Company C, as a notice party and not a party to the relevant contract dispute, lacked standing to seek inter partes discovery under r.12 and that, if discovery from a non-party (or from a party to a separate counterclaim) were required, the correct route would be a non-party discovery application under O.31 r.29. Company A and the Plaintiffs also contended the categories sought were overbroad, vague and amounted to a fishing expedition, and that the discovery was being sought for use in separate litigation ("the Solicitors' Proceedings") to which Company A and the Plaintiffs are not parties.

Legal Issues Presented

1. Whether Company C, joined as a notice party to the Substantive Proceedings, is entitled to seek Inter Partes Discovery under O.31 r.12 from the Plaintiffs and Company A in respect of documents relating to the alleged 2014 Agreement and its enforcement.
2. Whether Company C may justify its r.12 Inter Partes Discovery application on the basis that it is a defendant to Company B's counterclaim (i.e., whether that status permits inter partes discovery against Company A, which is not a party to the counterclaim) or whether discovery from Company A in that context requires a non-party discovery application under O.31 r.29.
3. Whether the discovery sought is necessary, relevant and proportionate to the issues in the pleadings and/or whether the application is an impermissible attempt to secure documents for use in other litigation (the Solicitors' Proceedings).

Arguments of the Parties

Company C's (Notice Party / Counterclaim Defendant) Arguments

• Company C argued that O.31 r.12 applies because the words "any party" and "any other party" embrace Company C, Company A and the Plaintiffs in relation to Company B's counterclaim; consequently it should be entitled to inter partes discovery from the Plaintiffs and Company A.
• Company C contended that, as a defendant to the counterclaim, it is entitled to discovery against Company A as well as the Plaintiffs because claim and counterclaim will be determined together; fairness and reciprocity (given Company A had taken inter partes discovery from Company C by agreement) supported reciprocal discovery rights.
• Company C relied on joinder principles (Order 15 r.13 and authorities such as Charles Kelly Ltd and BUPA) to contend that its joinder as a notice party reflected a vital interest and that case-management directions had contemplated disclosure applications by Company C.
• Company C asserted that the documents sought were not otherwise available and were relevant both to the Substantive Proceedings and to related Solicitors' Proceedings in which it sought specific performance of undertakings concerning redemption of charges; it said the material would be relevant to issues in those related proceedings and to being "fully on notice" of issues in the Substantive Proceedings, given Company B's counterclaim seeking to reverse the transfer.

Plaintiffs' Arguments

• The Plaintiffs argued that discovery must be relevant and necessary and grounded on the pleadings; Company C is a notice party and is not advancing or defending an issue in the Substantive Proceedings and has no standing to seek discovery under r.12 in respect of the Plaintiffs' dispute with Company A.
• The Plaintiffs contended that Company C's stated desire to be "on notice" or to identify possible causes of action in other litigation does not justify inter partes discovery and that the requests amounted to a fishing expedition and a "general trawl".
• They submitted that Company C had not shown how the categories sought would be evidence of any issue in the Substantive Proceedings or how the documents would advance its case or damage an adversary's case in those proceedings.

Company A's Arguments

• Company A submitted that, as a notice party, Company C could not seek inter partes discovery under r.12 because it was not an opponent in the Substantive Proceedings in relation to the 2014 Agreement; if discovery from Company A was required in relation to the counterclaim (to which Company A is not a party) the correct route was a non-party discovery application under r.29 (with usual undertakings as to confidentiality and costs).
• Company A emphasised that Company C's voluntary request had been framed as being by the notice party and referred to the Claim rather than the Counterclaim; the request therefore did not legitimately entitle Company C to act as a counterclaim defendant for the purposes of r.12 against Company A.
• Company A also contended the categories were too broad, vague and amounted to a fishing expedition; further, Company C had been offered conditional access to discovery agreed between the Plaintiffs and Company A but had not availed of that offer nor shown why it was insufficient.
• Company A relied on prior authorities (including Allied Irish Banks plc v Ernst & Whinney) to support the proposition that r.29 is the proper route where discovery is sought from persons not party to the relevant claim or counterclaim.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
Chambers v Times Newspapers Ltd [1999] 2 IR 424	Cited on r.29 non-party discovery requirements (noting requirement to show relevance/necessity and that non-party discovery seldom appropriate before exhausting inter partes routes).	The Court referenced it as authority for the requirements of r.29 and the need to show relevance, necessity and that discovery is not accessible by other means.
Charles Kelly Limited v Ulster Bank Ireland Limited [2019] IEHC 711	Joinder principles under O.15 r.13: whether joinder is necessary to enable the Court to adjudicate effectually and completely and whether a party has a vital interest in the outcome.	The Court applied the approach to conclude that Company C's joinder could only be justified as to reliefs that might directly affect it (i.e. consequential reliefs), not as an open-ended entitlement to litigate underlying contractual terms which it did not contractually hold.
BUPA Ireland Ltd v Health Insurance Authority (No. 1) [2005] IESC 80; [2006] 1 IR 201	Examples of notice parties having a "vital interest" in public law contexts and being entitled to robust participation.	The Court noted the contrast between public law notice parties (who may participate fully) and private law notice parties; BUPA illustrated that notice-party participation depends on context, and it did not support a broad inter partes discovery entitlement in private law claims.
Lyell v Kennedy (1883) 8 App. Cas. 217	Discovery is traditionally an entitlement to obtain documents from one's opponent; interrogation and discovery operate in an adversarial context.	The Court relied on this authority to support the proposition that r.12 is generally intended to operate between opposing parties and not to empower strangers to the relevant contractual dispute.
Manatee Towing Co & Anor v Oceanbulk Maritime SA [1999] CLC 1197 (Manatee)	English decision adopting a pragmatic approach permitting discovery even where the discovery related to matters not in issue between the applicant and respondent, in rare circumstances.	The Court considered Manatee in detail but declined to follow its broader approach, concluding that Irish r.12 wording and established authorities favour restricting inter partes discovery to opposing parties; even if Manatee applied, the present case did not present the rare justification relied upon in Manatee.
Brown v Watkins (1886) 16 QBD 125	Early authority interpreting "any other party" as meaning the "opposite party" and limiting discovery to opposing parties where there is a right to be adjusted.	The Court relied on Brown v Watkins to support the traditional limitation of r.12 to opposing parties and to reject Company C's claim of a general entitlement to inter partes discovery as a notice party.
Shaw v Smith (1887) 18 QBD 183	Discovery between co-defendants is permitted only where there is "a right to be adjusted" between them; discovery must have some foundation in rights between the parties.	The Court invoked Shaw v Smith to reinforce that discovery must relate to issues between the parties to the application and that Company C lacked the requisite "right to be adjusted" in relation to the 2014 Agreement.
O'Donoghue v Martin [2019] IEHC 598	Illustrates that counterclaims are separate actions and may require distinct procedural routes (e.g., leave requirements) and that counterclaims can be independent of the plaintiff's claim.	The Court used the decision to support the proposition that counterclaims are independent and that discovery against a party who is not party to a counterclaim requires r.29 non-party discovery.
Claddagh Jewellers Ltd [2020] IEHC 325	Practical significance of the independence of claims and counterclaims; counterclaims can continue even if the original claim is discontinued.	The Court cited Claddagh as part of the authorities confirming counterclaims' independence and the need to treat discovery in light of those distinctions.
Compagnie Financière du Pacifique v Peruvian Guano Company [1882] 11 QBD 55	Classic definition of relevance for discovery: documents are relevant if they enable the applicant to advance their case or to damage their adversary's case.	The Court relied on the Peruvian Guano formulation to emphasise that discovery under r.12 is intended to assist opposing parties in litigating a lis between them and that Company C had not shown such litigious benefit.
Ryan v Dengrove DAC [2022] IECA 155 (Dengrove)	Emphasises proportionality between burden of discovery and the degree to which documents would advance the applicant's case or damage their opponent's.	The Court cited Dengrove in regard to proportionality considerations and concluded Company C had not met that test.
Tobin v Minister for Defence [2019] IESC 57; [2020] 1 IR 211 (Tobin)	Discusses discovery principles and proportionality; endorses prior authorities on discovery's function.	The Court referenced Tobin in support of proportionality and relevance requirements for discovery.
Dome Telecom Ltd v Eircom Ltd [2007] IESC 59; [2008] 2 IR 726 (Dome Telecom)	Authority on discovery principles and the need for proportionality and relevance in disclosure.	Invoked to support the general discovery framework applied by the Court.
Astrazeneca AB v Pinewood Laboratories Limited [2011] IEHC 159 (Astrazeneca)	Confirms need for proportionality and relevance in discovery.	Used to reinforce the Court's emphasis on proportionality and necessity of discovery.
Allied Irish Banks plc v Ernst & Whinney [1993] 1 IR 375	Referenced as illustrating the need to use O.31 r.29 for discovery from persons who are not parties to the relevant claim (the judgment was said to involve a non-party discovery context).	The Court cited it to support the proposition that discovery from persons not party to the relevant claim should proceed under r.29 rather than r.12.
Sheehy and McAuley v The Government of Ireland and Ors. (High Court, 30 July 2002, unreported)	Authority on the impermissibility of materially diverging from the basis of a voluntary discovery request when bringing a formal motion.	The Court applied the principle to refuse to allow Company C to alter fundamentally the basis of its voluntary request by advancing a counterclaim basis that had not been the basis of the original request.
Swords v Western Proteins Limited [2001] 1 IR 324	Procedural principle similar to the above on reliance on the original basis of requests and pleadings.	Relied upon to support the proposition that Company C could not rely on a different basis for discovery than that in the voluntary request.
Roussel v Farchepro Ltd [1999] 3 IR 567	Authority that documents obtained on discovery may be used in other proceedings only with the Court's leave; otherwise an implied undertaking restricts use.	The Court cited Roussel to emphasise that Company C could not properly seek discovery in the Substantive Proceedings for the primary purpose of use in separate Solicitors' Proceedings without leave (and that seeking discovery for other litigation is an abuse).
Fitzwilton Ltd v Mahon (High Court, 16 February 2006, unreported)	Observation that there is no difference in principle between the approach to discovery in plenary and judicial review proceedings.	The Court cited the judgment to support that discovery principles apply similarly in private law plenary proceedings and that notice parties without pleadings lack a concrete pleading foundation for discovery.
Ballyboden Tidy Towns Group v An Bord Pleanála [2024] IESC 4 (Ballyboden)	Discusses notice parties in judicial review: once joined on the basis of vital interest, interested parties may participate fully and be subject to costs and related liabilities.	The Court cited Ballyboden to show the distinction between public law notice-party participation (which may be full) and the different considerations in private law litigation.
Barlow v Fanning [2002] 2 IR 593; YAP v Children's University Hospital Temple Street Limited [2006] IEHC 308	Authority cautioning courts to keep private proceedings limited to the parties the plaintiff chooses to sue; joinder of parties to private actions is not to be lightly made.	The Court used these authorities to support skepticism about broad, unfettered participation rights for notice parties in private law matters.
Delany & McGrath on Civil Procedure (text)	Textual exposition that counterclaims constitute separate actions and may be tried together but remain independent.	The Court relied on the textbook to explain the independence of counterclaims and the need to treat discovery requests in light of that independence.
Abrahamson, Dwyer & Fitzpatrick, Discovery and Disclosure (3rd ed., 2019)	Discusses equitable origins of discovery and a party's entitlement to inspect an opponent's documents.	The Court invoked the text to support the conceptual basis that discovery traditionally serves adversarial litigation between opponents, not strangers to the lis.
Dowling & Ors v Minister for Finance & Ors [2013] IESC 58	Discusses the difference between private law and public law proceedings and the implications for joinder and participation.	The Court cited it when distinguishing the public law position on notice parties from private law contexts.

Court's Reasoning and Analysis

Judge Kennedy's analysis proceeded in stages, grounded in the text of the RSC, established authorities and the factual record before the Court. The Court's reasoning can be summarised as follows:

1. Preliminary framing: The Court limited its consideration to discovery orders appropriate to the Substantive Proceedings. Documents obtained by discovery are subject to an implied undertaking restricting their use to the proceeding in which they were obtained unless the Court grants leave for other use; accordingly, Company C's attempt to obtain discovery in these proceedings primarily to use in the Solicitors' Proceedings was treated as an abuse of process.
2. Distinction between inter partes (r.12) and non-party (r.29) discovery: The Court emphasised that r.12 traditionally envisages discovery requests between parties who are opposing each other on issues in dispute. Counterclaims are separate and independent proceedings in many respects; if Company C sought discovery from Company A in respect of Company B's counterclaim and Company A was not a party to that counterclaim, the proper route would be an r.29 non-party discovery application. The Court relied on authorities and procedural rules (including Delany & McGrath and O.21 provisions) to support this distinction.
3. Role and limits of a notice party in private law proceedings: The Court analysed the jurisprudence on notice parties, noting the contrast between public law contexts (where notice parties frequently have a "vital interest" and may participate fully) and private law claims. The Court found no evidence as to the rationale for Company C's joinder, and observed the joinder order did not specify the extent of Company C's participatory rights. Absent clear evidence or a Court direction conferring an expanded role, joinder as a notice party in private law proceedings does not imply an unfettered right to litigate or to seek discovery as to issues in which the notice party is a stranger.
4. Application of discovery principles: The Court applied traditional discovery principles (relevance, necessity and proportionality) and older authorities (Brown v Watkins, Shaw v Smith, Lyell v Kennedy, Peruvian Guano) to conclude that r.12 inter partes discovery is intended to assist opposing parties in litigating issues between them and cannot be used by a notice party to mount a general search for documents about an issue it does not itself assert or defend.
5. Treatment of Manatee: The Court considered the English decision in Manatee (which allowed discovery in rare circumstances even where the discovery related to matters not in issue between the applicant and respondent) but declined to adopt its broader approach. The Court concluded the wording of Irish r.12 and established Irish authorities support limiting inter partes discovery to opposing parties; even if Manatee's approach were available, the present case did not present the exceptional factors relied upon in Manatee.
6. Procedural correctness of Company C's application: The Court observed that Company C's voluntary discovery request had been framed by reference to the Substantive Proceedings (the Claim) rather than the Counterclaim and that Company C later attempted to advance a different basis (as counterclaim defendant) in formal motions. The Court found this divergence impermissible; the requests were not supported as inter partes discovery in respect of the Counterclaim and, to the extent they sought discovery from Company A (not a party to the Counterclaim), r.29 would be required.
7. Insufficiency of Company C's showing: Independently of the procedural objections, the Court found Company C had not established the necessity, relevance and proportionality of the categories sought. The parameters of discovery between the Plaintiffs and Company A had been resolved; Company C had been offered conditional access to that discovery but had not availed of that offer nor shown why it was insufficient; Company C's categories were overbroad and amounted to a fishing expedition. These failures weighed against granting inter partes discovery or a non-party discovery order.
8. Consequence for discovery for other proceedings: The Court reiterated that documents discovered in this action cannot be used in other litigation without leave and that Company C's attempt to secure discovery in this action for use in the Solicitors' Proceedings was an improper purpose and would amount to an abuse of process.

Holding and Implications

HOLDING: The Court held that Company C (the Notice Party) is not entitled to seek Inter Partes Discovery under O.31 r.12 in the Substantive Proceedings. The Court further held that Company C cannot justify its current discovery application by reference to its status as a defendant to Company B's counterclaim because Company A is not a party to that counterclaim; discovery from Company A in that context would require a non-party discovery application under O.31 r.29. The Court also found Company C's applications flawed because they sought discovery for use in separate Solicitors' Proceedings and because Company C had not demonstrated the relevance, necessity and proportionality of the categories sought (and had not availed of conditional access offered by Company A).

Implications:

• Direct effect: The discovery applications made by Company C under O.31 r.12 were refused on the grounds set out above. Company C cannot obtain inter partes discovery from the Plaintiffs or Company A in the Substantive Proceedings on the bases advanced in its motions.
• Non-party discovery route preserved: The Court confirmed that Company C may, in due course, seek non-party discovery under O.31 r.29 (for example from Company A in the Counterclaim or in the Solicitors' Proceedings), but any such application must identify precise categories, demonstrate relevance, necessity and proportionality, and show the documents are not obtainable by other means (including from parties to the relevant claim). Company C's failure to avail itself of proffered access to relevant discovery counted against it in any such application.
• No broad new principle established: The Court followed established authorities and declined to adopt an expansive approach to inter partes discovery (such as that in Manatee). The decision emphasises the traditional limitation of r.12 to opposing parties and the distinct role of r.29 for non-party discovery; the judgment does not purport to create new precedent expanding inter partes discovery entitlements for notice parties in private law claims.

Case management: The matter was listed for final orders on 16 October 2025 at 10:30am.

Appearances (Anonymized)

Attorney Hudson instructed by Law Firm A for the Plaintiffs.

Attorney Naidoo instructed by Company A's in-house legal department for Company A (First Defendant).

Attorney Ní Dhúgáin instructed by Law Firm B for Company B (Second Defendant).

Attorney Clifford instructed by Law Firm C for Company C (Notice Party).