The Personal Injury Pre-Action Protocol Explained
Before any UK personal injury claim is issued at court, both sides are required to follow a structured set of pre-court steps called the Pre-Action Protocol for Personal Injury Claims. The protocol exists to encourage early settlement, force both sides to put their cards on the table, and avoid the cost of unnecessary court proceedings. In practice, most claims settle within or shortly after the protocol — never reaching a courtroom at all.
In this guide
- What Is a Pre-Action Protocol?
- The Three Main Stages of the Protocol
- Medical Evidence and Settlement Negotiation
- What Happens If the Protocol Is Not Followed?
- How Long Does the Protocol Take?
- When the Protocol Cannot Be Followed
- The Rehabilitation Code
- Common Questions About the Pre-Action Protocol
- Related Guides
- Our Partner's Fees Explained
- Check If You Could Claim Compensation For Your Injury
This guide explains how the protocol works, the deadlines that apply at each stage, what happens if either side fails to comply, and why most cases settle inside the protocol rather than progressing to court.
What Is a Pre-Action Protocol?
Pre-Action Protocols are sets of rules under the Civil Procedure Rules (CPR) that govern how parties to a civil claim should behave before issuing court proceedings. Different types of claim have different protocols. For personal injury claims, the main ones are:
- The Pre-Action Protocol for Personal Injury Claims — the main protocol covering most road traffic, workplace, and public liability claims above the Official Injury Claim portal threshold
- The Pre-Action Protocol for the Resolution of Clinical Disputes — for medical negligence claims (see our clinical pre-action protocol guide)
- The Pre-Action Protocol for Low Value Personal Injury Claims in Road Traffic Accidents — for OIC portal cases up to £25,000
- The Pre-Action Protocol for Low Value Personal Injury (Employers’ Liability and Public Liability) Claims — for EL/PL portal cases up to £25,000
- The Pre-Action Protocol for Disease and Illness Claims — for industrial disease cases
This guide focuses on the main Personal Injury Pre-Action Protocol — the framework that applies to most claims outside the small-claims and portal systems.
The Three Main Stages of the Protocol
A typical protocol-stage personal injury claim runs through three structured phases:
Stage 1 — Letter of Notification
In some cases the solicitor sends an initial Letter of Notification to put the defendant on notice that a claim may follow. This is optional and is most often used in serious-injury cases where early engagement with the defendant’s insurer helps secure rehabilitation funding and interim payments. For most standard claims, the Letter of Notification is skipped and the case starts at Stage 2.
Stage 2 — Letter of Claim
The formal start of the protocol. The Letter of Claim is a structured document that sets out:
- The claimant’s identity and a summary of the case
- The date and circumstances of the accident
- The injuries sustained and a brief description of treatment
- A description of the financial losses (special damages)
- The allegations of negligence — the specific failings being attributed to the defendant
- The relevant statutory provisions or duties relied on
- A request for the defendant’s insurer details (if not known)
- A request for any relevant documents the defendant holds
The Letter of Claim is the document that formally puts the defendant on notice. From this point, specific time limits apply.
Stage 3 — Acknowledgement and Response
The defendant has:
- 21 days to acknowledge receipt of the Letter of Claim
- Three months from the date of acknowledgement to investigate the claim and provide a formal Letter of Response
The Letter of Response must state whether liability is admitted, denied in whole, or denied in part, and must give reasons for any denial. If the defendant relies on specific documents or facts, those must be disclosed at this stage.
The three-month investigation period is one of the most important built-in pauses in UK civil litigation. It exists to give both sides time to gather evidence properly rather than rushing to court.
Medical Evidence and Settlement Negotiation
After the Letter of Response, the case typically moves through:
1. Medical Examination
The claimant attends an independent medical examination, often arranged through MedCo for soft-tissue claims or directly with a specialist for more serious injuries. The resulting medical report is disclosed to the defendant.
2. Special Damages Schedule
The claimant prepares a detailed schedule of financial losses — past and projected. For serious cases this may be supported by forensic accountancy and care expert reports.
3. Settlement Negotiation
With medical evidence and special damages in hand, the parties typically enter formal settlement negotiations. Many cases settle at this stage. Tools used include:
- Without-prejudice settlement offers from either side
- Part 36 offers — formal offers with cost consequences if rejected
- Joint Settlement Meetings (JSMs) — face-to-face or video discussions
- Mediation, particularly for higher-value or complex cases
See our should I accept the first compensation offer? guide for how the negotiation typically progresses.
What Happens If the Protocol Is Not Followed?
The protocol has teeth. A party who fails to comply faces cost sanctions even if they ultimately win the case. Typical consequences:
- Late or inadequate Letter of Response — costs penalties against the defendant, sometimes including the costs of issuing proceedings that could have been avoided
- Failure to disclose relevant documents — adverse inferences at trial, plus cost orders
- Premature issue of court proceedings before completing the protocol — costs penalties against the claimant, even if the case ultimately succeeds
- Unreasonable refusal to mediate — costs penalties, sometimes substantial, against the refusing party
These rules create strong incentives for both sides to engage constructively during the protocol period, which is why most UK personal injury claims settle without ever reaching court.
How Long Does the Protocol Take?
A typical protocol-stage claim runs as follows:
- Letter of Claim sent — Day 0
- Defendant’s acknowledgement — by Day 21
- Defendant’s Letter of Response — by approximately Day 110 (three months after acknowledgement)
- Medical examination and report — typically Day 90 to Day 180
- Settlement negotiation — Day 180 onwards
- Settlement reached — most cases within Day 270 to Day 540 (9 to 18 months from Letter of Claim)
For more complex cases — serious injury, disputed liability, contested medical evidence — the protocol can take longer. For simpler cases (admitted liability, straightforward soft-tissue injury) it can be much faster. See our how long does a claim take guide for the wider picture.
When the Protocol Cannot Be Followed
In some cases the standard protocol timeline must be shortened or bypassed:
- Limitation about to expire — if the three-year limit is close, proceedings must be issued to protect the position, even if the protocol is not complete. The court usually accepts this
- Urgent injunction needed — for example to preserve evidence the defendant might destroy
- Defendant refuses to engage — if the defendant ignores the Letter of Claim entirely, proceedings can be issued and the costs sanctions usually fall on the defendant
- Claimant’s medical condition is deteriorating — for example in fatal industrial disease cases, where expedited claims are common
See our time limits guide for the limitation rules in full.
The Rehabilitation Code
Alongside the protocol, UK personal injury claims operate under the Rehabilitation Code 2015 — a voluntary code that encourages early rehabilitation rather than waiting for settlement. Insurers and claimant solicitors can jointly fund:
- An Immediate Needs Assessment by a rehabilitation case manager
- Private physiotherapy, occupational therapy, or psychology
- Initial home or workplace adaptations
- Vocational rehabilitation for return to work
Rehabilitation funding does not commit the insurer to admitting liability — it is provided to help the claimant recover, not as compensation. The Rehabilitation Code is particularly important in serious-injury claims and is one of the practical advantages of using a specialist solicitor.
Common Questions About the Pre-Action Protocol
Do I need a solicitor to follow the protocol, or can I do it myself?
You can technically do it yourself, but it is rarely advisable. The Letter of Claim has specific technical requirements; the negotiation stage involves complex valuation; and any error during the protocol can prejudice the case later. The protocol is structured to work efficiently with specialist solicitors on both sides — going it alone usually produces worse outcomes. Most personal injury claims run on no win no fee, so the cost of a solicitor is not normally an upfront barrier. See our no win no fee solicitors guide.
The defendant ignored the Letter of Claim. What happens?
If the defendant does not acknowledge within 21 days or respond within three months, the claimant can issue court proceedings. The defendant will usually face cost penalties for the failure to engage with the protocol, and the protocol’s evidential framework remains in place once proceedings are issued. In practice, most defendants do respond within the time limits — particularly where there is clear liability — because the costs consequences of not doing so are substantial.
Can the protocol take more than six months?
Yes, often. The protocol’s three-month investigation period is a minimum, not a maximum. Complex cases — particularly those involving disputed liability, multiple defendants, or serious-injury quantum — often run for 12 to 18 months in the protocol before settling. The protocol is designed to allow this time rather than rush to court.
What if I want to settle before the medical evidence is complete?
It is almost always better to wait. Settling without specialist medical assessment means accepting compensation without knowing the true value of the case. Once accepted, settlements cannot generally be reopened, even if the injury turns out to be worse than expected. See our should I accept the first compensation offer? guide.
How does the protocol interact with the Official Injury Claim portal?
Low-value road traffic accident claims (under £5,000 general damages) generally go through the OIC portal under a separate, simpler protocol — not the standard Personal Injury Pre-Action Protocol. The OIC portal is designed for direct use by claimants without solicitor representation. For higher-value claims, motorcycle/cyclist/pedestrian claims, and cases involving multiple injuries that exceed the threshold, the standard protocol applies. A specialist solicitor will identify which route is right for your case.
Does the protocol apply to medical negligence claims?
No — medical negligence has its own protocol. The Pre-Action Protocol for the Resolution of Clinical Disputes covers most NHS and private healthcare cases. The structure is similar (Letter of Claim, Letter of Response, time limits) but with longer investigation periods given the complexity of medical cases. See our clinical pre-action protocol guide.
Related Guides
How the Personal Injury Claim Process Works
How Long Does a Personal Injury Claim Take?
Will My Personal Injury Claim Go to Court?
Proving Liability in a Personal Injury Claim
Evidence Needed for a Personal Injury Claim
Civil Procedure Rules Explained for Personal Injury
Should I Accept the First Compensation Offer?
Check If You Could Claim Compensation For Your Injury
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