The Court of Appeal’s decision in Kay v Martineau Johnson (A firm) [2026] EWCA Civ 224 is an important recent authority on limitation in solicitor professional negligence claims. The appeal concerned the application of section 14A of the Limitation Act 1980 and, in particular, when a claimant is to be treated as having the relevant knowledge to start the extended three-year limitation period. The proceedings were issued on 6 March 2023, and the central issue was whether the claim had already become time-barred. The Court of Appeal dismissed the appeal and held that it had. The decision is significant because, although all three members of the Court reached that conclusion, they did not do so on precisely the same reasoning. The judgments therefore contain a careful and valuable analysis of actual knowledge, constructive knowledge and the proper operation of section 14A in professional negligence cases based on allegedly defective legal advice.

Background

The underlying claim arose out of matrimonial finance proceedings. The claimant instructed the defendant solicitors in December 2007. A settlement was reached at a financial dispute resolution hearing on 25 April 2008 and was later embodied in a consent order on 29 September 2008. The settlement provided, among other things, for the claimant to receive the net proceeds of sale of Manor Cottage, a £4,000 lump sum for spousal maintenance, and 80% of any money recovered from a claim against a builder who had carried out work to the property. The claimant later alleged that she had been negligently advised to enter into that settlement when she should instead have been advised to investigate her former husband’s means further, including by reference to forensic accountancy and pension evidence, to consider relief under section 37 of the Matrimonial Causes Act 1973, and to preserve future claims by seeking a nominal spousal maintenance order rather than agreeing to a clean break. Her case was that, had she been properly advised, she would not have entered into the settlement on those terms.

The chronology mattered. The claimant’s concerns revived soon after the settlement had been concluded. In October 2008 she approached the same solicitors to ask whether the settlement could be reopened. In November 2008 she was advised that there was no basis for setting it aside, and that advice was repeated in May 2009. The firm ceased to act in June 2009. Much later, on 27 March 2020, counsel was instructed to advise on whether the settlement could be reopened. On 3 May 2020 counsel advised in writing that such an application would not succeed, and the claimant then said that there might be a claim against the solicitors. Proceedings were not issued until March 2023.

At first instance, the judge determined a preliminary issue on limitation in favour of the solicitors. He held that the claimant had actual knowledge for section 14A purposes by no later than the end of 2009. Alternatively, he held that she had constructive knowledge by then. In any event, he held that she plainly had constructive knowledge by no later than the end of 2018. On that basis, the claim was out of time. The claimant appealed.

The statutory framework

Section 14A provides an extended limitation period for negligence claims where the claimant did not have the relevant knowledge when the cause of action accrued. The three-year period runs from the earliest date on which the claimant first had both the knowledge required for bringing the action and a right to bring it. The required knowledge is not knowledge that the defendant has been negligent as a matter of law. Rather, it is knowledge of the material facts about the damage and knowledge that the damage was attributable, in whole or in part, to the act or omission alleged to constitute negligence. Section 14A(7) explains that the “material facts about the damage” are such facts as would lead a reasonable person who had suffered that damage to consider it sufficiently serious to justify instituting proceedings against a defendant who did not dispute liability and was able to satisfy a judgment. Section 14A(8) identifies the other relevant facts, including that the damage was attributable to the act or omission alleged to constitute negligence and the identity of the defendant. The section also contains a constructive knowledge provision, under which a claimant may be treated as having knowledge that could reasonably have been acquired from observable facts or from facts ascertainable with expert advice, if it was reasonable to seek that advice.

That framework frequently gives rise to difficulty in solicitor negligence cases. A client may know that the outcome was disappointing or even seriously prejudicial without yet appreciating that it may be attributable to negligent advice. Equally, the law does not permit a claimant to postpone time indefinitely by failing to investigate matters which a reasonable person would have explored. The authorities therefore draw a careful distinction between actual knowledge and constructive knowledge, and Kay is a particularly useful illustration of that distinction in practice.

The Court of Appeal’s decision

The appeal was dismissed. The principal judgment was given by Newey LJ. Males LJ agreed that the appeal should fail, but differed in part on whether the claimant had constructive knowledge as early as 2009. Lewis LJ agreed that the claim was time-barred and agreed with Newey LJ’s conclusion on the later period, but preferred the analysis of Males LJ on the earlier constructive knowledge issue. The decision therefore yields three central conclusions. First, the Court unanimously rejected the first instance finding that the claimant had actual knowledge in 2009. Secondly, the Court divided on whether she had constructive knowledge in 2009. Thirdly, all members of the Court agreed that, whatever the position in 2009, she had constructive knowledge by 2018 or 2019 at the latest, with the result that proceedings issued in March 2023 were too late.

Actual knowledge

On actual knowledge, the Court of Appeal held that the first instance finding could not stand. The claimant undoubtedly knew by 2009 that the settlement had left her in a poor position and that she was dissatisfied with the outcome. That, however, was not enough. In a case based on allegedly negligent legal advice, knowledge of loss and dissatisfaction does not of itself amount to knowledge that the adviser may have been at fault. Section 14A required something more, namely enough for the claimant actually to appreciate that the damage might be attributable to the adviser’s act or omission. The court’s reasoning is important because it draws a clear distinction between facts capable of supporting an inference of negligence and the claimant’s actual appreciation of that possibility. It is not enough that the material available would have permitted such an inference. For actual knowledge, the claimant must in fact have drawn it.

On the facts, although the claimant had reason to be concerned about the settlement and to seek advice about it, the advice she had been given by the solicitors still appeared to her to be sound and reliable. It had not in fact occurred to her that the solicitors themselves might have been to blame. Males LJ agreed that actual knowledge had not been established, but made an important analytical point in doing so. He considered that the issue should be approached by reference to the language of the statute itself, rather than by asking whether the claimant had “some reason to consider” that the advice may have been wrong. In his view, that alternative formulation risked blurring the distinction between actual and constructive knowledge. The fact that an objective observer might suspect negligence did not mean that the claimant herself actually knew enough for section 14A purposes.

Constructive knowledge in 2009

The more difficult issue concerned constructive knowledge in 2009. On this point the judgments diverged. Newey LJ held that constructive knowledge was not established at that stage. A significant feature of the case was that the claimant had gone back to the same solicitors and asked whether the settlement could be revisited. They advised her in unqualified terms that it could not. Newey LJ considered that it was reasonable for her to seek that advice from them and to accept it. If the solicitors had thought that there was a potential negligence issue, one might have expected them to tell her to seek independent advice. They did not do so. In those circumstances, he concluded that she could rely on the proviso in section 14A(10). She had taken reasonable steps to obtain advice and was not to be fixed with knowledge that could only have been obtained by going elsewhere for further expert advice.

Males LJ took a stricter view. He accepted that it was reasonable for the claimant to ask whether the settlement could be reopened, but regarded that as a different question from whether she ought reasonably to have investigated whether her position had been caused by bad advice from her own solicitors. Once she had been told that the settlement was final and could not be undone, the relevant question became whether a reasonable person in her position ought to have sought advice directed specifically to possible negligence. On that analysis, asking whether the underlying order could be revisited was not the same as taking all reasonable steps to investigate whether the solicitors had been at fault. Since the judge’s findings showed that she knew enough by then to justify investigating that possibility, Males LJ concluded that the protection in section 14A(10) was unavailable. Lewis LJ agreed with that analysis.

That disagreement is the most interesting feature of the appeal. It shows that there may be a real distinction between seeking advice directed to the underlying legal problem and seeking advice directed to whether the professional adviser was negligent. In some cases, the former may be enough to protect a claimant from constructive knowledge. In others, the court may regard it as insufficient if the claimant has enough information to justify investigating negligence specifically. For solicitor negligence practitioners, that part of the decision is likely to prove particularly useful where a former client has first returned to the original adviser after an adverse outcome.

The later period: 2018 or 2019

All members of the Court were, however, agreed that the claim was in any event out of time on the later-period analysis. Newey LJ and Males LJ treated the claimant as having constructive knowledge by the end of 2018. Lewis LJ agreed that she had the requisite knowledge in 2018 or 2019, which was still more than three years before proceedings were issued in March 2023. By then, she had renewed her attention to the settlement, sought documents and file material, and was actively revisiting the circumstances in which the order had been made. Counsel was instructed in 2020 to advise on whether the matrimonial settlement could be reopened, and the Court concluded that there was no sufficient reason why equivalent advice could not have been sought materially earlier. Even on the analysis most favourable to the claimant, the extended three-year period had therefore long since expired before proceedings were issued.

Impecuniosity

The treatment of impecuniosity is also important. The claimant sought to explain the delay by reference to lack of means, but that argument failed. Newey LJ held that the inquiry under section 14A(10) is principally objective. The judgment indicates real doubt as to whether impecuniosity will ever be capable of affecting the analysis under section 14A(10), but makes clear that, if it can do so, such cases will be rare. A claimant who seeks to rely on impecuniosity must provide detailed evidence as to financial circumstances and how those circumstances prevented appropriate advice from being obtained. On the facts, that threshold was plainly not met. The evidence did not come close to showing one of those rare cases, and it suggested that the delay was caused more by lack of prioritisation than by shortage of money.

The place of Haward v Fawcetts

A further point of real value is the place of Haward v Fawcetts (A Firm) [2006] 1 WLR 682 in the reasoning. Haward confirms that time begins to run when the claimant knows enough of the material facts about the damage for it to be reasonable to begin investigating whether that damage is attributable to the acts or omissions alleged to constitute negligence. The claimant does not need to know the precise details of the negligence or conclusively identify every act or omission. That authority helps to explain why, even though the claimant did not have actual knowledge in 2009, the Court was still prepared to hold that by 2018 or 2019 the circumstances were such that a reasonable person ought to have taken steps materially earlier to investigate the possibility of negligence.

Practical implications

The decision confirms the need to distinguish carefully between actual knowledge and constructive knowledge. In advice cases, a poor or disadvantageous outcome is not enough on its own. Time does not start merely because the client knows that matters have turned out badly. What matters is whether the client knew, or ought reasonably to have known, enough to appreciate that the adviser may have caused the damage. The decision also demonstrates that, where a former client returns to the original adviser after the event, the precise nature of the inquiry may be critical. Asking whether the underlying outcome can be undone is not necessarily the same as asking whether the adviser was negligent. The case also underlines the difficulty of relying on impecuniosity to postpone constructive knowledge. General assertions of financial difficulty are unlikely to suffice, and the evidential burden will be demanding.

Conclusion

Kay v Martineau Johnson (A firm) [2026] EWCA Civ 224 is an important Court of Appeal authority on section 14A in solicitor negligence claims. Its significance lies not only in the conclusion that the claim was time-barred, but in the Court’s careful treatment of what a claimant must know, actually or constructively, before time begins to run. The judgment makes clear that dissatisfaction with an outcome is not the same as knowledge that a solicitor may have been negligent. At the same time, it shows that claimants cannot postpone time indefinitely where a reasonable person would have taken further steps to investigate the possibility of negligent advice. For practitioners dealing with solicitor negligence claims, especially those arising out of earlier litigation or settlement advice, the decision is likely to become a useful and frequently cited authority on the operation of section 14A.