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Mars Capital Finance Ireland DAC v Sullivan and Ors
Factual and Procedural Background
On 25 March 2026, the High Court substituted Company A for the original plaintiff and granted an interlocutory injunction requiring the Defendants to vacate The Property. The Court also struck out separate proceedings brought by the Second Named Defendant as an impermissible collateral attack on an existing possession order and an abuse of process. [1][2]
The Defendants vacated The Property, later returned, and subsequently vacated again following enforcement-related proceedings. The Second Named Defendant then made applications seeking to set aside the High Court orders or stay their operation pending appeal. Applications for direct appeal to the Supreme Court and stays before the Court of Appeal were unsuccessful. [3][4][5]
The present application sought leave under Order 28, rule 1 of the Rules of the Superior Courts to deliver an “Amended Defence and Counterclaim” and have it deemed duly delivered. The Plaintiff opposed the application, arguing that it attempted to reopen a final possession order and introduced a new defence and counterclaim. [6][7]
Legal Issues Presented
- Whether the Defendants should be granted leave under Order 28, rule 1 to deliver the proposed amended defence and counterclaim. [6][8]
- Whether the proposed pleading was procedurally compliant and sufficiently identified the amendments sought. [9][10]
- Whether the proposed claims improperly sought to reopen determined possession proceedings, constituted an abuse of process, or amounted to a collateral attack on existing orders. [11][12][13]
- Whether the substitution of Company A required amendment of the Defendants’ defence concerning title, standing, and entitlement to maintain the proceedings. [14][15]
Arguments of the Parties
Defendants’ Arguments
- The Defendants sought to raise issues concerning allegedly unfair contractual terms and argued that a national court may be required to examine such terms of its own motion before granting enforcement-related relief affecting a consumer’s dwelling. [16][17]
- They argued that the substitution of Company A required them to reconstruct their defence and raised questions concerning Company A’s entitlement to maintain and enforce the proceedings. [18][14]
- They relied on the limited effect of Supreme Court determinations on applications for leave, submitting that those determinations did not prevent the proposed pleading. [19][20]
Plaintiff’s Arguments
- The Plaintiff argued that the proposed pleading sought to reopen a final and executed possession order by raising matters that should have been advanced before that order was made. [7]
Table of Precedents Cited
| Precedent | Rule or Principle Cited For | Application by the Court |
|---|---|---|
| Henderson v Henderson 67 E.R. 313 | Finality of litigation and prevention of collateral attacks or abuse of process. | The proposed pleading sought to revive issues that had been or should have been raised earlier, contrary to the rule. [2][21][13] |
| Start Mortgages DAC v Sullivan [2025] IEHC 681 | Prior determination of the relevant issues. | The Court relied on the earlier judgment as part of its conclusion that the issues had already been comprehensively addressed. [2] |
| Impresa Pizzarotti & C. SpA v Comune di Bari (Case C-213/13) | Principles of res judicata, legal certainty, and finality within the European Union legal order. | The Supreme Court referred to these principles when refusing direct appeals. [21] |
| Doyle v Houston [2025] IECA 187 | Principles governing a stay where granting it would permit continuation of an unlawful state of affairs. | The High Court relied on the decision when refusing a stay of its orders. [22] |
| Pepper Finance Corporation (Ireland) DAC v Cannon [2020] IESC 2 | A court may, in an appropriate case, assess of its own motion whether consumer-contract terms may be unfair. | The Supreme Court held that this obligation does not remove the need to identify a term capable of assessment or displace finality principles. [23] |
| Croke v Waterford Crystal Ltd [2004] IESC 97 | Principles relevant to whether amendment is required concerning title and standing. | The Court held that no amendment was necessary merely to require Company A to prove title and standing. [15] |
| Dormer v Allied Irish Banks plc [2017] IECA 199 | Principles relevant to amendments concerning title and standing. | The decision supported the conclusion that the existing defence was sufficient for putting Company A on proof. [15] |
| Re Vantive Holdings [2009] IESC 68 | Principles relevant to amendment and proof of title or standing. | The Court relied on the decision, alongside the other authorities, in rejecting the claimed need for amendment. [15] |
Court's Reasoning and Analysis
Order 28, rule 1 gives the Court a discretionary power to permit amendments where necessary to determine the real issues in controversy. Although that power is generally exercised liberally, it does not require permission for a procedurally irregular, legally unsustainable, or abusive pleading, or one introducing a claim bound to fail. [8][11]
The proposed document was procedurally defective because it did not identify the amendments with reasonable clarity. Instead, it replaced the existing defence with a lengthy new defence and counterclaim. That defect alone justified refusal. [9][24]
Substantively, the pleading again raised allegedly unfair mortgage terms without identifying the specific terms, the alleged unfairness, or the legal consequences. It also purported to advance claims on behalf of persons who were not parties to the proceedings. [25][26]
The Supreme Court had already rejected the attempt to raise an unidentified unfair-terms case after execution of the possession order. The proposed pleading sought to revive the same controversy, thereby undermining finality and attempting to use the amendment jurisdiction as a collateral challenge to binding orders. [27][28][29][12]
The Court further found substantial overlap between the proposed amendments and the separate proceedings previously struck out as an abuse of process. Reintroducing those matters would circumvent the earlier ruling and offend the rule in Henderson v Henderson. [30][13]
The substitution of Company A did not require reconstruction of the defence. The Defendants remained entitled to require Company A to prove title, standing, and entitlement to maintain the proceedings within the existing defence. [14][15]
Holding and Implications
APPLICATION DISMISSED. The Court refused leave to deliver the proposed amended defence and counterclaim under Order 28, rule 1. [31]
The Defendants could not use the amendment procedure to reopen the possession proceedings, revive issues already determined, or mount a collateral challenge to binding orders. The ruling directly prevented delivery of the proposed pleading; the opinion identifies no broader new precedent. [12][31]
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