The Barclays FOS costs judgment shows how a disputed interpretation of legal jurisdiction can move from an operational issue into significant litigation and costs exposure. The High Court ordered the Financial Ombudsman Service (FOS) to meet 92% of Barclays’ costs and 100% of the costs of Santander, NatWest and Vanquis following the banks’ successful judicial review.
The legal significance goes beyond the immediate costs award. Mr Justice Dexter Dias rejected the argument that the possibility of a “chilling effect” on a public body justified substantial protection from ordinary costs consequences, while distinguishing discretionary decision-making from what the court described as a hard-edged question of law.
For organisations exercising decision-making powers, the practical point is clear: where an operational approach depends on a contested interpretation of the organisation’s legal jurisdiction, the issue can require legal and governance attention before it becomes embedded across multiple decisions.
The dispute arose after Barclays, Santander, NatWest and Vanquis challenged FOS decisions concerning complaints about allegedly unfair credit relationships. The relevant unfairness test was section 140A of the Consumer Credit Act 1974, while the judicial review focused on the FOS’s interpretation of the time limits governing its jurisdiction.
The banks succeeded and the relevant ombudsman decisions were quashed. The subsequent costs judgment establishes three important practical points.
First, an organisation performing a public-interest function does not automatically receive protection from adverse costs when it unsuccessfully defends a legal interpretation. Second, unsuccessful subsidiary arguments do not necessarily produce a mechanical reduction in recoverable costs. Third, litigation conduct and the way an organisation develops or changes its legal position can itself become relevant to costs exposure.
The decision therefore provides a useful institutional risk model: jurisdictional interpretation → repeated operational reliance → legal challenge → invalidated decisions → litigation and costs exposure.
Four customers had complained that their credit relationships with their respective banks were unfair, largely because allegedly unaffordable credit facilities had been extended through overdrafts or credit cards.
The banks challenged the FOS’s interpretation of its jurisdiction over those complaints. The substantive judicial review succeeded and the High Court quashed the challenged ombudsman decisions.
The later judgment dealt with who should bear the costs of that litigation and in what proportion.
Risk starts with jurisdiction
Legal risk can arise before the merits of an underlying complaint are resolved where the organisation’s power to determine that complaint depends on a disputed interpretation of jurisdiction. If that interpretation is used repeatedly, the resulting exposure may extend beyond one decision and affect a wider body of cases.
Barclays succeeded on the central issue but not on every argument it advanced.
Its separate Article 1 Protocol 1 ground failed. The court nevertheless found that the ground occupied only a small proportion of the hearing and did not materially increase the costs of the case as a whole.
Rather than treating the failed argument as automatically requiring a large costs deduction, the court assessed its relative importance, reasonableness and impact on overall expenditure.
The result was an 8% reduction, leaving Barclays entitled to recover 92% of its costs following detailed assessment. Santander, NatWest and Vanquis were not subject to equivalent reductions.
That approach is important for litigation strategy. A party that succeeds on the central legal question may still face a costs reduction for unsuccessful arguments, but the court’s assessment is not necessarily mathematical. The significance and cost consequences of those arguments matter.
The FOS argued that the court should take account of the possible chilling effect of imposing adverse costs upon a body operating in the public interest.
The judge considered the Supreme Court’s reasoning in Competition and Markets Authority v Flynn Pharma Ltd, but concluded that a chilling effect could not simply be assumed. Evidence and the circumstances of the particular body and decision were relevant.
Several factors were significant. The FOS is not a statutory regulator; the underlying dispute concerned a hard-edged legal question; and the FOS had provided no evidence showing why an adverse costs order would inhibit its ordinary work.
The court also drew a distinction between determining the limits of jurisdiction and the exercise of discretion by individual ombudsmen.
Exposure grows with reliance
Exposure escalates when a disputed legal interpretation moves beyond an isolated decision and becomes the basis for continuing institutional action. A successful judicial review can then affect not only the validity of the challenged decisions but also create substantial costs consequences from defending the interpretation in court.
The decision trigger is reached when the organisation’s ability to continue applying an operational approach depends upon a contested interpretation of its legal jurisdiction.
That is different from disagreement about how a decision-maker should exercise discretion within an accepted jurisdiction. The High Court specifically characterised the underlying issue as a hard-edged legal question and stated that a public body such as the FOS was required to interpret the law correctly.
For institutional purposes, that is the point at which the matter should no longer be treated solely as an individual case-management issue. If the same interpretation governs multiple decisions, the consequences of error may become systemic rather than case-specific.
Legal and governance functions therefore need to understand whether the contested interpretation determines the organisation’s authority to act, how widely that interpretation is being applied, and whether continuing reliance upon it could expose multiple decisions to challenge.
Action threshold reached
The action threshold is reached where continued operational decision-making depends on a contested interpretation of legal jurisdiction rather than an individual exercise of discretion. At that point the issue can affect the validity of multiple decisions and create wider litigation and costs exposure, making it an institutional governance concern rather than a routine case issue.
The judgment does not prescribe a compliance programme, but its reasoning points to a clear governance distinction.
Where the dispute concerns discretionary judgment within an accepted legal power, ordinary case-management processes may remain appropriate. Where the dispute concerns whether the organisation possesses the legal jurisdiction to act at all, the risk is materially different.
A defensible institutional response requires clarity over the legal basis being relied upon, awareness of whether the interpretation is being applied across multiple cases and consistency in the organisation’s legal position once challenged.
That last point is reinforced by the court’s treatment of litigation conduct.
The judgment criticised changes in the FOS’s presentation of part of its case. The court found that the defendant had sought to resile from an earlier stated position, creating unnecessary forensic dispute, and described another argument advanced during the part-heard hearing as fundamentally flawed. An additional statutory defence had not originally been pleaded, although the court allowed it to be advanced; it also failed.
By contrast, the court found no general unreasonableness in Barclays’ conduct and described its leadership of the litigation as proportionate and skilful.
The practical lesson is that exposure does not stop when proceedings begin. The consistency, proportionality and legal coherence of the litigation response can become part of the eventual costs analysis.
The precise final figures remain subject to detailed assessment, but the allocation has been determined.
Barclays is entitled to 92% of its assessed costs. Santander, NatWest and Vanquis are each entitled to 100%.
The court also ordered payments on account. The FOS must pay 50% of the relevant recoverable proportion of each claimant’s claimed costs within 14 days of the order.
The court recognised that the litigation was complex, protracted and of wider public importance. It noted that the substantive decision had the capacity to affect thousands of consumer complaints and that the FCA had intervened to oppose the legal position advanced by the FOS.
The wider value of the judgment lies in the distinction it draws between public-interest decision-making and protection from the financial consequences of legal error.
The court did not accept that the possibility of a chilling effect was sufficient without evidence. Nor did it accept that ordinary adverse costs principles ceased to apply simply because the unsuccessful defendant carried out a public-interest function.
Mr Justice Dexter Dias concluded that there was no appreciable or plausible chilling effect on ordinary ombudsman decision-making. He also accepted the submission that a costs order could instead support good administration by discouraging bad or obviously flawed legal points.
Governance pattern
Where a legal interpretation determines the jurisdiction underpinning multiple decisions, risk can extend beyond the original case. Judicial review may test not only the validity of that interpretation but also the consistency of the organisation’s litigation position and the resulting costs exposure.
The final amount payable by the FOS has not yet been determined because the costs remain subject to detailed assessment.
The High Court expressly declined to prejudge that process. Its ruling determines the proportion of costs recoverable and the payments that must be made on account, rather than the final assessed total.
Barclays is entitled to 92% of its assessed costs, while Santander, NatWest and Vanquis are entitled to 100%. Payments on account must be made in accordance with the court’s order.
For organisations exercising public or quasi-public decision-making functions, however, the more durable significance is already clear. When a contested interpretation determines whether the organisation possesses jurisdiction to act, the risk is no longer confined to the individual decision before it.
The High Court’s judgment does not establish automatic full costs liability whenever a public body loses a judicial review.
It does establish that public-interest status alone does not demonstrate a chilling effect or justify substantial protection from ordinary costs principles.
It also demonstrates that failed subsidiary arguments, litigation conduct and the importance of the successful legal issue may all affect the eventual costs order.
Most importantly for governance purposes, the point at which a disputed legal interpretation determines the organisation’s jurisdiction is the point at which routine operational decision-making can become wider institutional legal risk.
A different form of jurisdiction risk arises in cross-border contracts. In the Conex guarantee dispute, the Commercial Court refused to pause an English claim despite related proceedings in Liberia, illustrating how contractual forum choices can leave businesses managing parallel litigation.
The analysis in this article is based on the High Court costs judgment in R (Barclays Bank UK plc and others) v Financial Ombudsman Service Limited, Neutral Citation [2026] EWHC 2298 (Admin), handed down by Mr Justice Dexter Dias on 7 September 2026.
The judgment follows the substantive judicial review identified by the court as R (Barclays & Ors.) v FOS [2026] EWHC 1555 (Admin).
