Category: Claims handling · Reviewed by Tim Roche, Director · PI & Commercial · Last reviewed 2026-06-11
A letter before action (also called a letter of claim or pre-action letter) is the formal notification by a prospective claimant that proceedings will be issued unless the matter is resolved — usually setting out the cause of action, the alleged facts and the relief sought.
The letter before action is the principal pre-action document. It is the moment the claim transitions from a dispute under negotiation into a credible threat of proceedings. For the recipient (and its insurer), it is the trigger for the formal claims-handling response under the relevant pre-action protocol.
The letter’s content varies by claim type, but the core elements are consistent: identification of the parties, the cause of action, the alleged facts, the damages sought, the requested remedy and a deadline for response.
The framework is the CPR Pre-Action Protocols regime. Each protocol prescribes the content of the letter of claim for that type of dispute. The general Practice Direction on Pre-Action Conduct also applies.
Key requirements common across protocols:
The Limitation Act 1980 sets the long-stop date by which proceedings must be issued — six years for most contract and tort claims, three years for PI claims, twelve years for claims under deed.
Failure to send a letter before action (where one is required by the relevant protocol) is itself a breach of pre-action conduct, attracting costs sanctions.
For an insurer-funded defence, the letter before action is the trigger for formal engagement:
The professional (the surveyor, solicitor, accountant, IFA, architect) receives the letter. They notify their PI insurer immediately — most policies require notification within a defined period of receipt of any letter alleging a claim.
The insurer acknowledges, instructs the panel firm, and begins the protocol response process. The letter of response (or “letter of acknowledgement” followed by a detailed response within 3 months in PN protocol cases) is the defence’s formal answer.
A well-prepared letter before action triggers a defined cycle that is the same regardless of the substantive merits: acknowledgement; investigation; response. The response either accepts the claim (rare), proposes settlement terms (occasional), or denies and sets out the defence (most common).
For the prospective claimant, the letter before action is also a strategic document. It signals seriousness, provides the formal record of the claim’s basis and triggers limitation considerations. A carefully drafted letter can also create reasonable expectations on quantum and timeline.
For mass-tort claims, the letter before action may be supplemented by a Group Litigation Order application; the GLO mechanics build on the underlying pre-action correspondence.
For consumer claims under the Money Claim Online and small claims track procedures, simplified pre-action correspondence may be sufficient. The threshold and procedure differ by claim value and type.
“Letter of claim” — the standard name for the document under the Professional Negligence Pre-Action Protocol.
“Letter of demand” — a more peremptory variant used in commercial debt and breach of contract claims.
“Without prejudice letter before action” — the letter is made without prejudice to invite settlement negotiations; less common because most letters are open documents.
“Group letter of claim” — a single letter on behalf of multiple claimants in a group action.
A surveyors firm receives a letter before action from a claimant solicitor regarding a 2022 commercial property valuation. The letter is structured under the Professional Negligence Pre-Action Protocol:
The defendant surveyor notifies its PI insurer within 24 hours. The insurer instructs the panel firm. The panel firm acknowledges within 21 days, conducts the investigation, takes counsel’s opinion and issues the letter of response at week 12. The response denies liability on the SAAMCO causation argument, sets out a counter-position on quantum and offers mediation. The matter proceeds through mediation and settles at £420,000 at month 9.
By Matt Bartlett, Director, on 2026-06-11. Next review: 2026-12-11.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-11. Apex Insurance Brokers Limited, FCA FRN 724952, Companies House 07014570. Not regulated advice — consult your broker on your specific position.
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