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 a Letter of Claim is used in clinical negligence claims in England and Wales. Learn what it is, why it matters, what it must contain, how defendants respond, relevant time limits under the Pre‑Action Protocol and practical considerations before court action.
A Letter of Claim plays a central role in clinical negligence cases in England and Wales. It is the formal document through which a claimant (usually a patient) sets out the basis of their allegation that they suffered harm because a healthcare provider failed to provide appropriate care. This letter forms a key part of the Pre‑Action Protocol for the Resolution of Clinical Disputes, which governs what must happen before a claim can be taken to court.
This article explains what a Letter of Claim is, how and when it is used in clinical negligence, what it must contain, how defendants respond, key time limits, and why this stage is critical to the success of a claim.
What Is a Letter of Claim?
A Letter of Claim (or letter before claim) is a formal written statement sent by a claimant (or the claimant's solicitor) to a healthcare provider to:
- Explain the claimant's allegations of clinical negligence.
- Give sufficient detail of the factual background, harm suffered, and losses incurred.
- Invite the defendant to investigate and respond.
It is not a court document but serves as an essential pre‑action step under the Civil Procedure Rules. It provides the defendant with sufficient information to understand the claim and carry out an initial investigation before any court proceedings are started.
Why a Letter of Claim Matters
Before a claimant can start formal court proceedings for clinical negligence, the Pre‑Action Protocol must be followed. The Letter of Claim ensures that:
- The defendant has early notice of the claim.
- Both sides exchange relevant information.
- The defendant has an opportunity to investigate before any litigation.
- Disputes may be resolved or narrowed without court involvement.
Courts expect compliance with the Protocol. Failure to serve an adequate Letter of Claim can lead to cost sanctions later if the case goes to court.
When Is a Letter of Claim Sent?
A Letter of Claim is usually sent after the claimant has obtained and reviewed their medical records and taken legal and, where necessary, expert medical advice. This ensures the claimant's solicitor is satisfied there are reasonable grounds for a clinical negligence claim - in other words, that it is more likely than not that:
- The healthcare provider owed the patient a duty of care,
- The care fell below the standard expected, and
- The breach caused loss or injury.
Once this assessment is made, the Letter of Claim should be prepared as soon as practicable and sent to the defendant under the terms of the Protocol.
What Information a Letter of Claim Must Contain
The Pre‑Action Protocol provides templates and clear guidance as to what should be included in a Letter of Claim. While the exact contents will vary depending on the case, key components usually include:
1. Summary of Facts and Chronology
The claimant must provide a clear summary of the events leading to the alleged negligence, including key dates, where treatment took place, and who was involved. This helps the defendant understand the background and context of the claim.
2. Allegations of Negligence
The letter must set out the main allegations. This will explain what the claimant alleges went wrong - whether an error was made, relevant omissions in care, or other failings.
3. Description of Injury and Loss
It should describe the claimant's injury, how this injury affects their health and life, and details of any financial loss (for example, loss of earnings, care costs, and other heads of damage). A broad indication of the compensation sought is usually included when practicable.
4. Reference to Supporting Documents
The Letter of Claim should reference relevant medical and other supporting documents and, where possible, include copies of those documents that the claimant already holds but that the defendant may not have.
5. Expert Evidence
If expert medical evidence has already been obtained before sending the letter - for example, an expert opinion on breach of duty or causation - the letter should give details of the expert and their discipline.
6. Copies to Insurers or Indemnifiers
In cases involving NHS trusts and many private healthcare providers, a copy is also sent to the relevant indemnity provider or insurer.
The Defendant's Obligations After Receiving the Letter
Once the defendant receives the Letter of Claim:
- They must acknowledge receipt, usually within 14 days.
- They are given four months to investigate the allegations and prepare a Letter of Response.
In the Letter of Response, the defendant addresses each allegation and may:
- Admit the claim in whole or in part.
- Deny liability with reasons.
- Request further information if needed.
If the defendant admits liability at this stage, the parties may be able to settle the claim without issuing formal court proceedings.
Time Limits and Procedural Requirements
The Pre‑Action Protocol places expected timescales on the Letter of Claim and the defendant's response:
- Proceedings generally should not be issued until four months have passed since the Letter of Claim has been served to allow the defendant time to respond.
- These timelines must be balanced against the statutory limitation period, which in clinical negligence is usually three years from the date of injury or the date the claimant became aware of the injury (date of knowledge). Missing these limits can prevent the claim from being brought at all.
Failure to comply with the Protocol without reasonable explanation may lead to cost penalties if the claim proceeds to court.
Settlement and Alternative Dispute Resolution
Following the Letter of Claim and Letter of Response, parties often enter negotiation or explore alternative dispute resolution (ADR) such as mediation. The Pre‑Action Protocol encourages this approach to try to resolve disputes before court action, potentially saving time, stress, and legal costs for both sides.
Risks and Practical Considerations
Clarity and Accuracy
Because the Letter of Claim frames the issues at an early stage, it must be drafted carefully with clear and accurate factual and legal assertions. Errors or omissions at this stage can complicate later steps if the matter reaches court.
Professional Advice
Most claimants use solicitors experienced in clinical negligence to prepare and send Letters of Claim. Solicitors ensure that all procedural requirements are met and that experts are instructed appropriately to support key allegations.
Final Thoughts
A Letter of Claim is a foundational step in a clinical negligence case in England and Wales. It is the first formal document that explains a claimant's allegations to a healthcare provider under the Pre‑Action Protocol for the Resolution of Clinical Disputes. Its proper preparation and service allow the defendant to investigate, respond, and potentially resolve the dispute without litigation. Understanding its purpose, timing, and required content is essential for both claimants and defendants navigating pre‑action steps in clinical negligence disputes.
