Material Contribution to Harm in Irish Law: When the But-For Test Bends

Definition Capsule: Material Contribution to Harm

What it is

A causation rule under which a defendant whose negligence made a more-than-de-minimis contribution to a divisible injury is liable for the harm so caused, even where other innocent or non-tortious factors also contributed.

Core test

Was the defendant's contribution to the harm more than negligible? If yes, causation is established for the materially contributed share of the injury.

Foundational authority

Bonnington Castings Ltd v Wardlaw [1956] AC 613 (House of Lords)

Irish leading authority

Quinn v Mid-Western Health Board [2005] IESC 19, [2005] 4 IR 1 (Kearns J)

Irish burden-shifting rule

Hanrahan v Merck Sharp & Dohme (Ireland) Ltd [1988] IESC 1, [1988] ILRM 629 (Henchy J): the onus may shift to the defendant where proof is "entirely beyond" the plaintiff's reach and "peculiarly within the range of the defendant's capacity of proof".

2025 development

Tolan v Brindley Manor Federation of Nursing Homes Ltd [2025] IEHC 327 — High Court entertained material contribution arguments at the interlocutory stage in a clinical negligence context.

Practical context

Industrial disease; occupational exposure; multi-factor clinical negligence; multi-defendant exposure cases.

Statutory interaction

Section 11(3) of the Civil Liability Act 1961 addresses concurrent wrongdoers where causal responsibility cannot be allocated between them.

Distinguished from

Material increase in risk (the McGhee/Fairchild rule, not adopted in Ireland) and loss of a chance (a separate doctrine recognised in Ireland: Philp v Ryan [2004] IESC 105).

Contents

What Material Contribution to Harm Means

Material contribution to harm is a causation rule that loosens, but does not abandon, the orthodox but-for test. The standard but-for question asks whether the plaintiff's injury would have occurred but for the defendant's wrongdoing. Where there is a single dominant cause, the test works cleanly. Where two or more causes operate together — some attributable to the defendant, others not — and the medical or scientific evidence cannot say which one in fact caused the injury, the but-for test risks defeating an otherwise meritorious claim.

The doctrine answers that risk by asking a different question: did the defendant's wrong make a contribution to the injury that was more than de minimis? Lord Reid in Bonnington Castings Ltd v Wardlaw [1956] AC 613 framed the threshold as a question of degree — anything that does not fall within de minimis must, in his words, be material. Where a divisible injury is concerned, the defendant who has materially contributed is liable for the harm so caused, with apportionment between contributors handled either by the court or by statute.

A Doctrinal Decision Tree

The questions an Irish court asks when faced with a multifactorial causation problem proceed in a stepped sequence. The orthodox but-for test is tried first; only if it fails are the alternative routes considered.

Origins: The UK Common Law Chain

The doctrine has a layered UK origin. Each step expanded — or was thought to expand — the circumstances in which a plaintiff could succeed despite scientific uncertainty.

Bonnington Castings Ltd v Wardlaw [1956]

The plaintiff contracted pneumoconiosis from prolonged exposure to silica dust at a steel foundry. Two sources contributed: "guilty" dust from swing grinders (where the employer had failed to provide adequate ventilation) and "innocent" dust from pneumatic hammers (no breach). The House of Lords held that, since the guilty dust contributed at levels that were not negligible to the lungs, it had materially contributed to the disease, and the plaintiff recovered in full. Bonnington remains the foundational authority and the most uncontroversial form of the doctrine — a defendant's tortious contribution to a divisible occupational disease is treated as causative.

McGhee v National Coal Board [1973]

The plaintiff was employed to clean out brick kilns and developed dermatitis from coal and brick dust adhering to his skin. The dustiness of the work itself was unavoidable and not alleged to be negligent. The breach lay in the employer's failure to provide showering or washing facilities at the workplace, which meant the plaintiff travelled home (cycling, as it happened) still caked in dust before he could wash. Medical evidence could not say whether the absence of washing facilities had in fact caused the dermatitis or had merely increased the risk that it would develop. The House of Lords held the employer liable on the basis that the breach materially increased the risk of injury. This is conceptually different from Bonnington: the defendant's wrong was treated as causative not because it was shown to have added to the harm but because it raised the probability of harm.

Fairchild v Glenhaven Funeral Services [2002]

Several plaintiffs developed mesothelioma after asbestos exposure with multiple successive employers. The mechanism of mesothelioma is such that a single fibre may trigger the disease, and medical science cannot identify which employer's exposure was responsible. The House of Lords applied a special rule: each negligent employer was treated as having materially increased the risk of harm and could be held liable, despite the impossibility of proving but-for causation against any single defendant. Fairchild is best understood as a narrow, mesothelioma-driven exception rather than a general loosening of causation.

Bailey v Ministry of Defence [2008]

Waller LJ in the English Court of Appeal stated the modern formulation for clinical negligence: where medical science cannot prove that, but for the negligence, the injury would not have occurred, but can prove the negligent contribution was more than negligible, the but-for test is modified and the claimant succeeds. Bailey is the case practitioners most often cite when material contribution arguments arise in modern clinical negligence litigation in England and Wales.

Holmes v Poeton Holdings Ltd [2023]

The English Court of Appeal in Holmes v Poeton Holdings Ltd [2023] EWCA Civ 1377 confirmed, on a point of law, that the Bonnington material contribution principle applies to indivisible as well as divisible injuries — resolving a long-running uncertainty. The court accepted that, where the principle applies, a claimant need not show but-for causation; a more-than-minimal contribution to the indivisible injury suffices for liability for the whole of the harm. The court was equally clear, however, that the principle is not a substitute for evidence: the claimant must still prove both generic causation (that the substance or insult is capable of causing the disease in question) and individual causation (that, on the facts, the tortious exposure in fact made a more-than-minimal contribution to this claimant's injury).

The outcome of the case is as instructive as the principle. The trial judge had found the defendant liable for the claimant's Parkinson's disease following workplace exposure to trichloroethylene (TCE). The Court of Appeal allowed the defendant's appeal: the evidence established only that TCE was a risk factor for Parkinson's disease, not that it was capable, on the balance of probabilities, of causing the disease (generic causation failed); and even if it had, there was no sufficient evidence linking the tortious component of the claimant's exposure to his particular disease (individual causation failed). The trial judge's finding was, in Stuart-Smith LJ's framing, not sustainable on the evidence. Holmes is therefore a double-edged authority: it confirms that material contribution reasoning is available in indivisible injury cases, while reinforcing how demanding the evidential threshold for actually meeting that test will be.

Material Contribution vs Material Increase in Risk

The two rules are often elided in practitioner shorthand, but they are doctrinally distinct, and the distinction matters in Ireland.

Material contribution to harm compared with material increase in risk

Concept	What the plaintiff must prove	Leading authority	Irish reception
Material contribution to harm	That the defendant's wrong contributed to the actual injury at a level greater than de minimis.	Bonnington Castings v Wardlaw [1956] AC 613	Recognised in narrower form; broadly consistent with the orthodox but-for analysis on divisible injuries.
Material increase in risk	That the defendant's wrong materially increased the risk of injury, even where it cannot be shown to have caused it on the balance of probabilities.	McGhee v National Coal Board [1973] 1 WLR 1; Fairchild v Glenhaven [2003] 1 AC 32	Not adopted by the Irish Supreme Court: Quinn v Mid-Western Health Board [2005] IESC 19.
Loss of a chance (separate doctrine)	That the defendant's wrong deprived the plaintiff of a quantifiable chance of a better outcome, even where the chance was below 50%.	Philp v Ryan [2004] IESC 105 (Irish authority); contrast Gregg v Scott [2005] UKHL 2 (UK position).	Recognised in Ireland for delayed cancer diagnosis cases — the Irish position is more plaintiff-friendly than the UK position.

The practical significance is this: the orthodox Bonnington form of material contribution rarely poses a doctrinal problem in Ireland, because it is essentially the but-for test applied to a divisible injury. The McGhee/Fairchild form — material increase in risk — is the genuinely controversial expansion, and it is the form Ireland has not adopted.

The Irish Reception: Quinn v Mid-Western Health Board

The leading Irish authority is Quinn v Mid-Western Health Board [2005] IESC 19, a Supreme Court judgment delivered by Kearns J on 8 April 2005 (judgment available on BAILII). The infant plaintiff was born with severe brain damage. The defendants conceded negligence in the failure to deliver the child earlier but contended that the damage had been caused by an acute episode in utero — an event for which they bore no responsibility — and that an earlier delivery would not have changed the outcome. The trial judge dismissed the claim. On appeal, the plaintiff invited the Supreme Court to adopt the Fairchild approach: to relax the but-for requirement and shift the onus of proof to the defendant.

The Supreme Court declined. Kearns J held that the orthodox principles of causation, properly applied, were adequate to the task and that the proposed alternatives risked compensating plaintiffs where no substantial connection between the injury and the defendant's conduct existed. He treated the more relaxed UK approaches as exceptional, to be confined to genuinely exceptional cases where the orthodox test would otherwise produce an unjust result.

Kearns J reasoned that the orthodox causation principles, properly applied, were adequate; the proposed alternatives risked compensating plaintiffs absent a "substantial connection" between the defendant's conduct and the injury. He acknowledged that he would adopt an alternative test in a future case if satisfied that the orthodox approach was producing substantive injustice — but he was not so satisfied on the facts of Quinn.

That reasoning continues to anchor the Irish position. Two points follow from it. First, but-for remains the default test in Irish negligence law and in clinical negligence in particular. Second, the door has not been definitively shut on a future relaxation: the judgment is explicit that an alternative remains available in principle if the orthodox test ever begins to defeat genuinely meritorious claims. As Kate Ahern observed in the Law Society Gazette in November 2024, Irish courts have to date failed to consider an alternative test — not, in her framing, a deliberate refusal to do so but an unfilled gap awaiting the right facts and the right argument.

The Burden-Shifting Rule in Hanrahan v Merck Sharp & Dohme

The closest Ireland has come to a domestic answer to the Fairchild problem predates Quinn by seventeen years. Hanrahan v Merck Sharp & Dohme (Ireland) Ltd [1988] IESC 1, [1988] ILRM 629 (judgment available on BAILII) was a private nuisance action by a Tipperary farmer whose livestock was injured and whose family suffered ill health following emissions from a nearby pharmaceutical plant. The plaintiffs faced a familiar evidential difficulty: causation depended on disputed scientific evidence about emissions, exposure pathways, and biological mechanism, much of it within the defendant's exclusive knowledge.

Henchy J in the Supreme Court, while declining to apply the Constitution to reverse the burden of proof generally, recognised a narrower exception. The onus may shift to the defendant where the act or default complained of is such that it would be fundamentally unjust to require the plaintiff to prove a positive averment, and where fairness and justice call for disproof by the defendant. Mere difficulty of proof is not enough: what is required is that proof must be entirely beyond the plaintiff's reach and peculiarly within the defendant's capacity of proof.

In a passage that has been cited repeatedly in subsequent Irish causation analysis, Henchy J held that theoretical or inductive evidence offered by a defendant cannot be allowed to displace proven facts as to the damage actually suffered. The Supreme Court partially reversed the High Court's causation finding and remitted the action for assessment of damages.

Hanrahan matters here because it offers a domestic Irish doctrinal mechanism — narrower than Fairchild but operating in a similar evidential space — through which a plaintiff facing genuine asymmetry of access to proof may obtain a softening of the orthodox burden. The rule has been most often invoked in environmental and toxic tort contexts, but its underlying logic — that the law should not require the impossible, especially where the impossibility is the defendant's own creation — is doctrinally available in any case where those conditions are met. Practitioners arguing causation in industrial disease or complex clinical negligence settings should consider whether Hanrahan reasoning, rather than imported Fairchild reasoning, addresses the evidential difficulty.

The 2025 High Court Position: Tolan v Brindley Manor

The most recent Irish judgment of practical interest is Tolan v Brindley Manor Federation of Nursing Homes Ltd [2025] IEHC 327, a High Court decision delivered on 4 June 2025 (judgment available on BAILII). Mr Justice Barr declined to strike out a clinical negligence claim at the interlocutory stage in circumstances where the plaintiff's case rested on a material contribution argument. The court was prepared to entertain reasoning drawn from Fairchild and McGhee as a basis for the case proceeding to trial, where causation could be properly tested on the medical evidence.

Tolan is not a Supreme Court ruling and does not displace Quinn. It is, however, a significant signal that the Irish High Court is willing to allow material contribution arguments to survive the threshold stage in clinical negligence cases of genuine scientific uncertainty — at least as a matter of arguability. The strategic implication for practitioners is that pleading material contribution in the alternative is no longer obviously vulnerable to a strike-out application, and that the substantive question of whether the Irish courts will follow Bailey or Holmes remains open for the trial judge in an appropriate case to address.

How the Doctrine Operates in Irish Personal Injury Practice

The narrower Bonnington-style version of material contribution does have a practical home in Irish litigation, even after Quinn. It tends to surface in four contexts.

Industrial and occupational disease

Where a worker contracts an occupational disease such as pneumoconiosis, hand-arm vibration syndrome, or noise-induced hearing loss following prolonged exposure, the disease is typically divisible — each tortious exposure adds to the cumulative dose. In those cases the orthodox but-for analysis can be satisfied without recourse to a special rule, because the negligent exposure has, on the balance of probabilities, made things worse. The doctrine's role here is largely descriptive: to explain why the defendant is liable for the share of the injury attributable to their breach, with apportionment handled in the assessment of damages.

Multi-defendant exposure cases

Where a worker has been exposed to a noxious substance through successive employers, Irish law approaches the problem partly through statute. Section 11(3) of the Civil Liability Act 1961 performs important practical work that, in the UK, is done by the Fairchild exception. It allows recovery in cases where it cannot be established which wrongdoer caused the damage, by deeming all of them to be concurrent wrongdoers — and the broader concurrent wrongdoer scheme then permits the plaintiff to recover in full against any of them, leaving contribution between defendants to be sorted out under section 21. The verbatim text of the provision is set out in its own section below.

Multi-factor clinical negligence

In clinical negligence, material contribution arguments are most often raised where a patient's injury arises from a combination of an underlying medical condition and a negligent omission or treatment error. Practitioners increasingly invoke the Bailey formulation when scientific evidence cannot conclusively show that the negligent factor was decisive but can show its contribution was more than negligible. The Irish courts have not formally adopted Bailey, and Quinn remains the binding authority — but as Tolan v Brindley Manor [2025] IEHC 327 illustrates, the High Court is willing to allow such arguments to survive a strike-out application and proceed to trial. The practical consequence is that material contribution arguments in Irish clinical negligence are most commonly developed in expert evidence and settlement negotiation, with the doctrinal question of formal adoption left to be addressed by the trial court when the right factual matrix presents itself.

Cumulative or aggravated injury

Where an initial negligent act is followed by a second negligent act that aggravates the injury — for example, a delayed diagnosis on top of an underlying disease, or a workplace incident worsened by inadequate emergency response — material contribution doctrine assists in attributing the aggravated portion of the harm to the second wrongdoer. This is closely related to, but distinct from, the eggshell skull rule and the question of novus actus interveniens.

Section 11(3) of the Civil Liability Act 1961: The Statutory Route

Because section 11(3) does so much of the practical heavy lifting in Irish multi-defendant exposure cases, it is worth setting out in full. The provision reads:

Where two or more persons are at fault and one or more of them is or are responsible for damage while the other or others is or are free from causal responsibility, but it is not possible to establish which is the case, such two or more persons shall be deemed to be concurrent wrongdoers in respect of the damage.

Civil Liability Act 1961, s.11(3) — official text on irishstatutebook.ie

Three features of the provision repay attention.

First, both candidates must be at fault. The provision does not deem a defendant a concurrent wrongdoer where only one of two candidate causes was tortious. This is a meaningful limit on the scope of section 11(3) compared to the English Fairchild exception, which can operate where some of the candidate exposures were innocent.

Second, the trigger is evidential. The plaintiff must show that it is not possible to establish which of the two or more at-fault parties was responsible for the damage. Where the evidence does support an attribution, the orthodox concurrent wrongdoer analysis under section 11(1) takes over and section 11(3) does not need to be reached.

Third, once section 11(3) is engaged, the consequence is significant. By treating all qualifying parties as concurrent wrongdoers, section 11(3) brings them within the section 12 joint and several liability scheme — meaning each is liable for the whole of the damage, with contribution between them to be apportioned under section 21. This is the practical mechanism by which an Irish plaintiff in a successive-employer industrial disease case can recover the full value of the claim from any one defendant, leaving the defendants to fight contribution among themselves.

Section 11(3) is not a perfect substitute for Fairchild: it requires fault on every side, addresses uncertainty as to which wrongdoer caused the damage rather than whether the damage was tortiously caused at all, and operates within the architecture of the 1961 Act rather than as a stand-alone causation rule. But it does dampen the urgency of any reception of Fairchild in Ireland — and it is the first place an Irish practitioner should look in a multi-defendant exposure case where causal attribution between candidates is contested.

UK Differentiation: Where Ireland Diverges

There are three points of divergence worth keeping clearly in mind.

First, the McGhee and Fairchild material-increase-in-risk principle has not been adopted in Ireland. In Quinn, Kearns J expressly considered and declined to apply that approach. A plaintiff in an Irish mesothelioma case cannot rely on Fairchild as binding authority. Recovery against multiple historical employers will, in practice, depend on the particular evidence and on section 11(3) of the Civil Liability Act 1961 doing the heavy lifting.

Second, the Bailey formulation of modified but-for in clinical negligence has not been formally adopted by the Irish Supreme Court. Practitioners and academics — including the analysis in the Law Society Gazette referenced above — continue to argue that Irish law should consider Bailey-style reasoning in cases of genuine scientific uncertainty, but the position remains unsettled. Until the Supreme Court speaks, the orthodox but-for test from Quinn controls.

Third, on the related but distinct question of loss of a chance, the Irish position is more generous to plaintiffs than the UK. In Philp v Ryan [2004] IESC 105, the Irish Supreme Court awarded compensation in a delayed prostate cancer diagnosis case where the plaintiff could not establish, on the balance of probabilities, that an earlier diagnosis would have changed the eventual outcome. The House of Lords in Gregg v Scott [2005] UKHL 2 took the opposite view in similar circumstances. The Irish doctrine of loss of chance is treated more fully on its own page; the relevant point here is that practitioners should not assume a one-way drift toward English causation orthodoxy. The picture is mixed.

Fourth, and important when comparing English and Irish authority directly, Ireland has a domestic burden-shifting rule of its own in Hanrahan v Merck Sharp & Dohme [1988] IESC 1. Where a plaintiff faces an evidential asymmetry that English law might address through Fairchild-style risk reasoning, Irish law looks instead to Hanrahan's narrower test: is proof entirely beyond the plaintiff's reach and peculiarly within the defendant's capacity? The two rules are doing similar work in adjacent doctrinal spaces, and the Irish practitioner who reaches for Fairchild without first considering Hanrahan may be missing the more readily available route.

Pleading and Proof: How Material Contribution Appears in an Irish Case

The doctrinal architecture is one thing; how it appears on the page in a real Irish case is another. The following is a short practitioner-oriented account of how material contribution arguments are typically pleaded and proven, drawn from the way the question presents itself in current Irish clinical negligence and industrial disease practice.

In the statement of claim

Causation is normally pleaded broadly enough to admit material contribution as a fallback. A common pleading structure is to plead first that the defendant's negligence caused the injury (the orthodox but-for case), then to plead in the alternative that the defendant's negligence materially contributed to the injury or to its severity. Some pleaders go further and plead, again in the alternative, that the defendant's conduct was such that the evidential burden ought to shift to the defendant under Hanrahan v Merck Sharp & Dohme principles. Drafting all three in the alternative — but-for, material contribution, Hanrahan — is conservative practice and avoids difficulties when the medical evidence shifts in the run-up to trial.

In the brief to the expert

The briefing of the causation expert is where material contribution arguments either succeed or fail. The expert needs to be asked, expressly, three questions: whether but-for causation is established on the balance of probabilities; if not, whether the defendant's negligence made a more-than-de-minimis contribution to the injury; and, where applicable, whether the medical or scientific impossibility of giving a definitive answer is itself a function of the defendant's conduct or of factors uniquely within the defendant's knowledge. An expert report that addresses only the first question — but-for — closes off the material contribution route before it has been opened.

The two-expert structure in clinical negligence

Most clinical negligence cases of any complexity require two expert reports: a liability expert (typically a clinician of the same speciality as the defendant, addressing whether the defendant departed from acceptable practice under the Dunne test) and a separate causation expert (often from a different specialty, addressing whether the breach changed the outcome). Material contribution arguments typically live in the second report. The State Claims Agency's standard defence in many clinical negligence cases is to admit, or not seriously contest, breach while fighting causation hard — which is precisely why the causation report is the report that matters.

The HC131/HC132 framework

Since the introduction of Practice Directions HC131 and HC132 in April 2025, expert evidence on causation in clinical negligence is subject to closer judicial control through the dedicated Clinical Negligence List. Causation experts can expect to be required to articulate the evidential basis for any material contribution opinion, to address the orthodox but-for analysis on its own terms, and to identify the points at which their opinion departs from but-for reasoning. The discipline imposed by HC131/HC132 has, if anything, raised the standard of expert reporting on causation in this jurisdiction — and, paradoxically, made well-supported material contribution arguments harder for defendants to dismiss as speculative.

Material Contribution in Practice

From the perspective of pleading and proof in Irish personal injury and clinical negligence litigation, four practical observations are worth keeping in view.

The first is that material contribution is most useful as an alternative basis for causation rather than the primary case. Where the evidence will support a but-for finding, that is the cleaner route. Material contribution arguments tend to develop alongside expert reports that grapple openly with multifactorial causation and with the limits of what medical or scientific evidence can prove on the balance of probabilities. A claimant well advised by counsel will normally plead causation broadly enough to admit the material contribution route as a fallback.

The second is that the Civil Liability Act 1961 does much of the work that Fairchild performs in the UK. Section 11(3) and the broader concurrent wrongdoer scheme under sections 11–14 mean that an Irish plaintiff is, in many multi-defendant cases, in a position to recover in full against any responsible defendant without requiring a doctrinal expansion. The reform debate over joint and several liability — discussed in the Civil Liability Act 1961 reference page — has practical implications for how material contribution arguments interact with apportionment.

The third is that, since the introduction of Practice Directions HC131 and HC132 establishing a dedicated Clinical Negligence List in the High Court in April 2025, expert evidence on causation is subject to closer judicial control than was previously the case. Causation experts can expect to be required to articulate the basis on which any material contribution opinion rests, and to address whether the orthodox but-for test would produce a different result.

The fourth, and frankly the most important in litigation as it actually unfolds, is that material contribution arguments more frequently shape settlement than they do judgments. Where the State Claims Agency or a defendant insurer is faced with a credible expert report identifying a more-than-trivial negligent contribution, the calculus of settlement shifts even where the defendant is confident of defeating the case on a strict but-for basis. The doctrine's practical reach in Ireland is broader than the bare authority of Quinn would suggest, because few cases ever reach a written judgment on causation.

Frequently Asked Questions

Related Provisions and Resources

Related Irish legislation

• Civil Liability Act 1961 — concurrent wrongdoers (sections 11–14), apportionment (section 34), and the section 21 contribution mechanism that handles multi-defendant attribution problems in Irish law.

Related claim-side guidance on this site

• Causation in Medical Negligence (Ireland) — the practical, claimant-facing companion to this doctrine page, including the role of expert evidence and the but-for test in practice.

Primary sources

• Quinn v Mid-Western Health Board [2005] IESC 19 — Supreme Court of Ireland (Kearns J), 8 April 2005.
• Hanrahan v Merck Sharp & Dohme (Ireland) Ltd [1988] IESC 1 — Supreme Court of Ireland (Henchy J), 5 July 1988.
• Tolan v Brindley Manor Federation of Nursing Homes Ltd [2025] IEHC 327 — High Court (Barr J), 4 June 2025.
• Philp v Ryan & Anor [2004] IESC 105 — Supreme Court of Ireland (Fennelly J), 17 December 2004.
• Civil Liability Act 1961 — official text on irishstatutebook.ie.

Commentary

• Kate Ahern, "Untangling the Threads" — Law Society Gazette, November 2024. Analysis of the material contribution doctrine and the Irish position post-Quinn.

References

1. Bonnington Castings Ltd v Wardlaw [1956] AC 613 (House of Lords). Pre-digital authority — no BAILII URL available.
2. McGhee v National Coal Board [1972] UKHL 7; [1973] 1 WLR 1. Judgment available on BAILII.
3. Fairchild v Glenhaven Funeral Services Ltd [2002] UKHL 22; [2003] 1 AC 32. Judgment available on BAILII.
4. Bailey v Ministry of Defence [2008] EWCA Civ 883; [2009] 1 WLR 1052. Judgment available on BAILII.
5. Holmes v Poeton Holdings Ltd [2023] EWCA Civ 1377. Judgment available on BAILII.
6. Hanrahan v Merck Sharp & Dohme (Ireland) Ltd [1988] IESC 1; [1988] ILRM 629 (Henchy J), 5 July 1988. Judgment available on BAILII.
7. Quinn (a minor) v Mid-Western Health Board [2005] IESC 19; [2005] 4 IR 1 (Kearns J), 8 April 2005. Judgment available on BAILII.
8. Philp v Ryan & Anor [2004] IESC 105; [2004] 4 IR 241 (Fennelly J), 17 December 2004. Judgment available on BAILII.
9. Gregg v Scott [2005] UKHL 2; [2005] 2 AC 176. Judgment available on BAILII.
10. Tolan v Brindley Manor Federation of Nursing Homes Ltd [2025] IEHC 327 (Barr J), 4 June 2025. Judgment available on BAILII.
11. Civil Liability Act 1961 (Ireland), Act No. 41 of 1961, sections 11–14, 21, 34. Official text on irishstatutebook.ie.
12. Kate Ahern, "Untangling the Threads", Law Society Gazette (November 2024).
13. Practice Directions HC131 and HC132, High Court of Ireland, effective April 2025 (Clinical Negligence List).

Case citations checked against BAILII and the Irish Statute Book. Last reviewed May 2026. Educational article only — not legal advice.