A UK Letter Before Action — also called a pre-action letter or letter of claim — is a formal written notice sent by a prospective claimant to a prospective defendant before civil court proceedings are issued in England and Wales. Unlike in many other jurisdictions where such letters are merely conventional, in England and Wales the letter before action is required by the Civil Procedure Rules 1998 (CPR) and the Pre-Action Protocols and Practice Direction on Pre-Action Conduct that sit within those rules. Failure to send a compliant letter before action before issuing proceedings can result in adverse costs orders against the claimant even if they ultimately succeed in court.

The CPR Pre-Action Protocols are designed to encourage parties to resolve disputes without litigation by exchanging information and considering alternative dispute resolution (ADR), particularly mediation. There are specific pre-action protocols for different types of claims — including debt claims, personal injury, professional negligence, construction and engineering disputes, defamation, and housing disrepair — and a general Practice Direction on Pre-Action Conduct and Protocols that applies to all claims not covered by a specific protocol. Each protocol has different requirements, but all require the claimant to provide the defendant with adequate information about the nature and basis of the claim, the amount sought, and a reasonable time to respond.

A compliant letter before action serves several important functions. First, it puts the defendant on formal notice of the claim and the amount sought, often prompting early settlement and avoiding the cost of litigation. Second, it demonstrates to the court — if proceedings are ultimately issued — that the claimant made genuine attempts to resolve the matter before resorting to litigation. Third, it invites the defendant to engage in ADR, which the courts now strongly encourage and, following Churchill v Merthyr Tydfil County Borough Council [2023] EWCA Civ 1416, may in some circumstances order. Fourth, it provides documentary evidence of the pre-action process, which is relevant to the court's costs discretion under CPR Part 44.

The 'without prejudice save as to costs' marking is routinely included on letters before action. This means the letter cannot be used as evidence of an admission or a concession on the merits in any subsequent proceedings, but it can be shown to the court when deciding costs — allowing the court to see that a party made a reasonable settlement offer or engaged constructively in pre-action conduct.

For debt recovery — the most common use case — the Pre-Action Protocol for Debt Claims (applicable to business claims against individuals) requires the creditor to allow the debtor at least 30 days to respond and to provide a specified Information Sheet and Reply Form. For business-to-business debt claims, the Practice Direction on Pre-Action Conduct requires a reasonable response period, typically 14 days for straightforward claims.

Before issuing any civil claim in the County Court or High Court of England and Wales where money, property, or a legal remedy is sought. The CPR and the relevant pre-action protocol require a letter before action to be sent in virtually all civil claims — not merely as good practice, but as a procedural requirement whose breach can result in costs sanctions.

When a business is owed money by another business or by an individual client — whether from unpaid invoices, an outstanding loan, or failure to return a deposit — and wishes to demand payment formally before instructing solicitors or issuing a claim in the County Court or High Court.

When a party has suffered loss as a result of a breach of contract — for example, a contractor failing to complete building works, a supplier delivering defective goods, or a service provider failing to perform to the agreed standard — and wishes to claim damages under the contract or in tort.

When a potential claimant has a professional negligence claim against a solicitor, accountant, architect, surveyor, or other professional whose negligent advice or conduct caused financial loss. The Pre-Action Protocol for Professional Negligence requires a preliminary notice and a detailed letter of claim before proceedings are issued.

When a property owner has suffered damage caused by a neighbouring occupier, contractor, or utility company, or when a landlord or tenant wishes to enforce repairing obligations, and proceedings are a possibility if the matter is not resolved.

When a construction dispute has arisen between an employer and a contractor, or between a main contractor and a sub-contractor, and the parties need to follow the Pre-Action Protocol for Construction and Engineering Disputes before commencing proceedings or applying for adjudication.

Parties — Identify both the sender (claimant) and recipient (defendant) by their full legal name, company registration number if applicable, and address. Accuracy is important because these names will appear on any court claim form if proceedings are issued. Proceedings issued against the wrong legal entity may be struck out or require an application to amend.

Date and Reference — State the date the letter is sent. The response deadline counts from this date. Include a reference to any relevant contract, invoice, or prior correspondence so the recipient can identify the matter immediately.

Without Prejudice Save as to Costs Marking — Mark the letter 'Without Prejudice Save as to Costs'. This prevents the letter from being shown to the court on the merits but allows the court to consider it when assessing costs — permitting the court to reward a party that made a reasonable offer and penalise a party that unreasonably rejected it.

Nature of the Claim — State clearly what type of claim is being made (breach of contract, debt, professional negligence, property damage, etc.) and identify the relevant pre-action protocol or practice direction being followed. Reference specific contract clauses, statutory provisions, or common law duties as appropriate.

Facts and Basis of Claim — Set out the facts giving rise to the claim in clear, chronological order. Include dates, amounts, and references to relevant documents. The level of detail required varies by protocol — the Pre-Action Protocol for Professional Negligence requires a particularly detailed letter of claim.

Amount Claimed — State the total amount being claimed in pounds sterling (GBP), broken down by principal sum, interest, and any additional losses. If claiming interest under the Late Payment of Commercial Debts (Interest) Act 1998 or section 69 of the County Courts Act 1984, state the applicable rate and the period for which interest is claimed.

ADR Proposal — Indicate willingness to engage in alternative dispute resolution. This is required by the Practice Direction on Pre-Action Conduct. Following Churchill v Merthyr Tydfil [2023], courts now have power to order ADR — a claimant who makes a genuine ADR proposal and is refused by the defendant is in a much stronger position on costs.

Response Deadline — Give the recipient a reasonable time to respond. For the Pre-Action Protocol for Debt Claims (business against individual), this is at least 30 days. For straightforward business-to-business debt claims, 14 days is standard. For professional negligence, construction, or complex commercial disputes, 30 days or more is appropriate.

Consequences of Non-Response — State clearly what will happen if no satisfactory response is received by the deadline: that proceedings will be issued without further notice and that costs will be sought. This is not a threat but a factual statement of the claimant's intended course of action.