The UK Supreme Court dismissed an appeal in AXA Insurance UK plc and another v Commissioners of Inland Revenue and another [2026] UKSC 24, providing guidance on the exercise of discretion under CPR 19.23(1)(a) in relation to group litigation orders (GLOs). This ruling may influence the law by providing clarity on the binding effect of GLOs on parties to other claims in the group register. Insurance companies and their clients are affected by this clarification, which means they may wish to consider the binding effect of GLOs when litigating or settling claims.

Full News Breakdown

The dispute centered on the interpretation and application of CPR 19.23(1)(a), which governs the preclusive effect of judgments or orders in group litigation. The core disagreement involved how the court's discretion to "order otherwise" should be exercised when determining whether a judgment relating to "GLO issues" binds all claims on the group register. The Supreme Court dismissed the appeal, providing authoritative guidance on this procedural rule.

• Case Name: AXA Insurance UK plc and another v Commissioners of Inland Revenue and another

• Court: UK Supreme Court

• Date: 24 [2026]

• Citation: [2026] UKSC 24

• EU Instruments / UK Legislation Cited: Civil Procedure Rules (CPR)

• Key Provisions: CPR 19.23(1)(a), which states that a judgment or order in group litigation concerning "GLO issues" binds parties to all other claims on the group register at that time, unless the court "orders otherwise."

• Primary Legal Issue: The exercise of discretion under CPR 19.23(1)(a) concerning the binding effect of group litigation orders (GLOs) on parties to other claims in the group register.

• Holding: The Supreme Court dismissed the appeal and provided guidance on the exercise of discretion under CPR 19.23(1)(a).

• Operative Order: The appeal was dismissed.

• Practical Outcome: The ruling clarifies the binding effect of GLOs on parties to other claims in the group register.

How Does This Affect You?

Before this ruling, uncertainty existed regarding the precise scope and application of the binding effect of group litigation orders on claims within the same group register. The Supreme Court has now resolved that GLO issues judgments are indeed binding on all other registered claims at the time, unless specific judicial discretion is exercised to the contrary. This shift affects parties involved in or considering multi-party litigation, as they may wish to assess the preclusive impact of GLO determinations on their individual claims.

For Lawyers & Advocates

• Counsel preparing a Part 36 offer in a GLO may wish to assess the binding preclusive effect of any current or anticipated GLO issues judgment on that offer, adjusting the risk premium to account for reduced avenues for separate litigation on common issues.

• Legal teams advising clients contemplating joining an existing group litigation order may want to conduct enhanced due diligence on the current GLO register, evaluating whether lead judgments already rendered on "GLO issues" under CPR 19.23(1)(a) will bind their client's claim without further argument.

• When drafting settlement agreements for claims on a group register, practitioners may consider including specific carve-outs or acknowledgements regarding the impact of any GLO issues judgments, to avoid unintended preclusion or an inability to pursue distinct remedies.

• Advocates arguing against the application of a GLO issues judgment to a specific claim may wish to demonstrate how the court's discretion to "order otherwise" under the CPR provision should be exercised, pointing to unique factual matrices or legal distinctions not adequately addressed in the group proceedings.

• Firms managing portfolio litigation where multiple clients share common issues with a GLO may want to model the financial impact of a binding GLO issues determination, advising clients on whether to opt-in, opt-out (if permissible), or pursue separate proceedings before an adverse ruling solidifies.

For Law Students

The decision provides an opportunity to examine the UK Supreme Court's commitment to refining procedural mechanisms to balance judicial efficiency in multi-party litigation with the fundamental right to a fair hearing. The core legal doctrine illuminated here is res judicata, particularly its application within statutory procedural frameworks like the Civil Procedure Rules to prevent re-litigation of common issues.

The decision is particularly relevant for the study of:

• EU and UK Litigation Procedure

• Civil Procedure Rules

• Multi-Party Litigation and Class Actions

• The Law of Remedies and Preclusion

Comparing this judgment with Ladd v Marshall [1954] 1 WLR 1489 (Court of Appeal) and Argyll v Argyll [1967] Ch 302 (High Court) teaches students how the principles of finality in litigation, traditionally applied to parties, are adapted and nuanced when a procedural rule, CPR 19.23(1)(a), grants specific judicial discretion to limit or extend such preclusive effects across a defined group.

For Businesses

• Corporate legal departments or General Counsel facing potential class action or mass tort claims may want to update their litigation risk assessments to account for the heightened preclusive effect of GLO issues, potentially re-evaluating defence strategies and settlement reserves for claims on or related to a group register.

• Boards of directors, particularly in industries prone to collective litigation such as financial services or product liability, may wish to review internal policies for managing multi-party disputes, ensuring that compliance and operational teams understand the binding nature of GLO determinations under the Civil Procedure Rules, specifically CPR 19.23(1)(a).

• Finance and M&A departments conducting due diligence on target companies with active or potential group litigation exposure may want to scrutinize the status of any GLO issues and their binding effect, as these could materially impact contingent liabilities and enterprise valuation following the Supreme Court's clarification.

• Companies processing claims on a GLO register may wish to establish clear internal protocols for monitoring GLO issues judgments, ensuring that any binding outcomes are promptly integrated into their claims handling and legal strategy, avoiding the risk of being inadvertently bound without proactive engagement.

Key Takeaways

• The Supreme Court clarified that a GLO judgment or order relating to "GLO issues" is binding on all claims on the group register unless the court orders otherwise, thereby refining the application of CPR 19.23(1)(a).

• Litigators may wish to conduct more rigorous analysis of the GLO register and the scope of "GLO issues" when advising on case strategy, settlement, or joinder in multi-party actions.

• Courts possess clearer authority to enforce the preclusive effect of GLO issues judgments across an entire group of claims, promoting judicial economy but requiring careful exercise of discretion.

• Industry bodies and legal reform groups may advocate for further guidance or amendments to the Civil Procedure Rules regarding the criteria for exercising discretion under CPR 19.23(1)(a) to "order otherwise."

• General Counsel may want to review current and prospective GLO exposure before their next board meeting.

Source: Supreme Court guidance on power to "order otherwise" under CPR 19.23 in group litigation