This guide is maintained as a current resource for August 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
Comprehensive guide to how settlements in clinical negligence claims in England and Wales can be challenged, explaining binding agreements, legal grounds for setting aside settlements (such as fraud, mistake or duress), procedural rules and practical steps for claimants and defendants.
In England and Wales, most clinical negligence claims are resolved through negotiated settlements, either before court proceedings start or during litigation. Settlements offer certainty, reduce legal costs, and provide compensation without the delay, stress and risk of a trial. However, once a settlement is agreed - typically by way of a consent order, Part 36 offer acceptance, or a negotiated agreement - it is generally binding and final. In limited circumstances, parties may be able to challenge, set aside or reopen a settlement, particularly where there are legal grounds that justify undoing what was agreed. This article explains how settlements are reached, the legal status of settlement agreements in clinical negligence, the limited grounds on which they can be challenged, the implications of challenging an agreement, and practical guidance for claimants and defendants.
What Is a Settlement in Clinical Negligence?
A settlement in clinical negligence is an agreement between the claimant (the person alleging harm) and the defendant (often the NHS trust, private hospital or clinician) to resolve the claim without a contested trial. Settlements are usually legal contracts recording the terms and typically include:
- A sum of money paid to the claimant in full and final settlement of all claims.
- A release clause preventing further claims about the same matters.
- Often, a consent order lodged with the court if proceedings have been issued. Settlement agreements may also be reached before court is involved, recorded in writing by solicitors for the parties.
Most clinical negligence claims settle because both parties want to avoid the time, cost and uncertainty of a full trial. Alternative dispute resolution (ADR) tools such as mediation or joint settlement meetings are increasingly used to facilitate settlement negotiations.
Legal Status of Settlement Agreements
Once executed, a settlement agreement is generally treated as a binding contract between the parties. Courts and tribunals seek to uphold the finality of litigation, giving effect to parties' consensual resolution rather than reopening disputes on evidential or tactical disagreements. This means that, in the absence of legal defects, settlements are normally enforced as agreed.
In litigation, if settlement terms are recorded in a consent order, the court has formally approved the agreement, and it becomes part of the case record. This adds further weight to the finality of the resolution.
Why and When a Settlement Might Be Challenged
Challenging a settlement in clinical negligence is exceptional. Legal principles on setting aside or overturning a settlement derive from contract law and equitable doctrines, meaning there must be a legally recognised defect when entering into the agreement. Common grounds include:
1. Fraud or Misrepresentation
A settlement may be challenged if it was induced by fraudulent misrepresentation - that is, one party knowingly provided false information or concealed material facts to persuade the other to settle. In Hayward v Zurich Insurance Company plc, the UK Supreme Court held that a settlement could be set aside where it was induced by fraud, even if the other side had suspicions at the time and even if the alleged misrepresentation only became clear later.
This principle means a claimant or defendant can seek to reopen a settlement where a party later discovers that key facts were deliberately misrepresented and that this misrepresentation materially caused the settlement.
2. Mistake
A settlement may sometimes be challenged where there has been a fundamental mistake about the terms or subject matter of the agreement, such that the parties lacked a true meeting of minds. This requires demonstrating that both parties were mistaken about a vital fact or that one party wrongly believed something foundational to the deal.
However, courts are cautious in applying mistake to set aside settlements, especially where procedural rules (such as Part 36 or the clinical negligence pre‑action protocol) govern offers and acceptance. Mistake claims must satisfy strict legal requirements to outweigh the policy of upholding finality.
3. Duress or Undue Influence
Settlements entered into under duress or undue influence - where one party's will was overborne by pressure that left them no realistic choice - may be vulnerable to challenge. Such cases are rare and require strong evidence that consent was not freely given. Principles from contract law on undue influence also inform this area, including cases outside the clinical negligence context confirming that a transaction can be challenged if influence was exerted in a way that undermined voluntary consent.
4. Lack of Capacity
A party who did not have the legal capacity to enter into a binding agreement (for example, due to mental incapacity at the time) may challenge a settlement on that basis. Capacity challenges require medical or other supporting evidence establishing that the person could not understand the nature of the contract when it was signed.
Procedural and Contractual Mechanisms
Part 36 Offers and Settlement Terms
In litigation, settlement often involves Part 36 offers under the Civil Procedure Rules (CPR). A Part 36 offer is a formal proposal to settle the claim on specified terms, with associated costs consequences if it is beaten at trial or accepted. Part 36 settlements are contractual in nature and generally enforceable. CPR Part 36 also contains rules for how offers must be made and accepted, and parties must carefully observe those rules to ensure the settlement is binding.
Once accepted, Part 36 offers normally produce final, binding agreements unless one of the narrow legal defects (such as fraud) is present.
Consent Orders
If proceedings have been issued and the parties reach a settlement, the terms are often recorded in a consent order submitted to the court. Once approved, the consent order becomes an enforceable court order, giving the claimant rights to enforce the terms if the defendant fails to comply.
Challenging a settlement recorded in a consent order can require an application to set aside the order or reopen the case, which is rare and typically grounded in serious procedural error, fraud, or similar defects.
Practical Steps When Challenging a Settlement
Seek Specialist Legal Advice
Clinical negligence settlements and potential challenges involve complex overlaps between civil procedure, contract law, equitable doctrines and litigation strategy. Individuals considering challenging a settlement should seek early advice from solicitors specialising in clinical negligence and civil litigation.
Evidence Gathering
Grounds such as fraud or mistake require credible evidence. For example, in a fraud challenge, evidence that misrepresentations were made and that they materially affected the decision to settle will be central. Evidence may include documents, witness testimony, expert opinions or new material that was not available at the time of settlement.
Timing and Limitation
While there is no single statutory limitation period specific to challenging a settlement, broader limitation principles under the Limitation Act 1980 may influence when related actions (for example, a claim to set aside an agreement or seek restitution) must be brought. Challenges based on fraud may suspend limitation until the fraud is discovered. Parties should act promptly when new material comes to light because undue delay can weaken a challenge, especially if the other side relied on the settlement.
Costs Risks
Challenging a settlement involves litigation costs, and unsuccessful challenges may expose the unsuccessful party to adverse costs orders. Cost risks should be carefully weighed alongside the merits of the legal grounds.
Common Questions
Can a clinical negligence settlement simply be reopened because one side regrets the amount?
No. Regret or poor legal advice alone is insufficient to set aside a settlement. There must be a legal defect such as fraud, mistake, duress or incapacity for a court to intervene.
Is new evidence enough to challenge a settlement?
New evidence may support a challenge, particularly in cases of previously undisclosed fraud or misrepresentation. However, it must be material and such that it demonstrates a legal basis for setting aside the agreement.
Can a Part 36 settlement be challenged?
Yes, but only on narrow legal grounds such as fraud or similar defects, not simply because one party wishes for different terms. Part 36 settlements are contractual and binding if properly made and accepted.
Final Thoughts
Settlements are a fundamental part of clinical negligence practice in England and Wales. They provide certainty, reduce costs and allow claimants and defendants to resolve disputes without a full trial. Once agreed, settlements are generally binding and final, but in exceptional circumstances, they may be challenged or set aside where there is demonstrable legal defect, such as fraud, fundamental mistake, duress or incapacity. Challenging a settlement involves navigating both civil litigation procedures and contract law principles, making early specialist legal advice essential. Understanding the limited scope and high legal threshold for challenges helps parties make informed decisions about accepting or contesting settlement agreements.
