A UK Cease and Desist letter, formally known as a Letter Before Action (LBA) or Warning Letter, is a written demand sent to a person or business in England and Wales requiring them to stop engaging in conduct that infringes the sender's legal rights. Unlike the United States, where cease and desist letters have a recognised informal status, the English legal system frames such letters within the Pre-Action Conduct framework of the Civil Procedure Rules (CPR). Practice Direction — Pre-Action Conduct and Protocols requires parties to exchange sufficient information about their dispute before issuing court proceedings, and a properly drafted Letter Before Action is the primary mechanism for meeting this obligation.

The letter serves multiple purposes. First, it puts the recipient on formal notice that their conduct is alleged to be unlawful, which is relevant to the assessment of damages and to applications for injunctive relief. Second, it demonstrates to the court that the sender has complied with the Pre-Action Protocol, which is important because non-compliance may result in costs sanctions under CPR Part 44. Third, it provides the recipient with an opportunity to cease the conduct voluntarily, potentially avoiding the time, expense, and uncertainty of litigation. Fourth, in intellectual property cases, it preserves the sender's position by establishing the date on which the infringement was notified, which affects the calculation of damages or accounts of profits.

Letters Before Action are used across a wide range of legal disputes. In intellectual property, they address copyright infringement under the Copyright, Designs and Patents Act 1988, trade mark infringement under the Trade Marks Act 1994, and the common law tort of passing off. In defamation, they address libel and slander claims under the Defamation Act 2013. In harassment cases, they address a course of conduct prohibited by the Protection from Harassment Act 1997. They are also used for breach of confidence (protecting trade secrets and confidential information), breach of contract, and other civil wrongs.

The Pre-Action Protocol for Intellectual Property Claims provides specific guidance for IP disputes. It recommends that the claimant's letter identify the intellectual property rights relied upon, describe the alleged infringement in sufficient detail for the defendant to understand the complaint, specify the remedies sought, and give the defendant a reasonable period to respond. For non-IP matters, the general Practice Direction — Pre-Action Conduct and Protocols applies. In both cases, the court expects the parties to have considered alternative dispute resolution before issuing proceedings.

A Letter Before Action (cease and desist) is needed whenever a person or business in England and Wales discovers that another party is engaging in conduct that infringes their legal rights and wishes to demand that the conduct stop before resorting to court proceedings.

Trade mark infringement is one of the most common triggers. Where a business discovers that a competitor is using an identical or confusingly similar trade mark on identical or similar goods or services, infringing the proprietor's exclusive rights under sections 9 to 12 of the Trade Marks Act 1994, a Letter Before Action demands that the infringer cease using the mark, deliver up or destroy infringing goods and materials, and provide undertakings not to repeat the conduct. Trade mark infringement can occur through use on websites, product packaging, social media, signage, and advertising materials.

Copyright infringement under the Copyright, Designs and Patents Act 1988 arises when a person copies, distributes, performs, or communicates to the public a substantial part of a copyright-protected work without the copyright owner's permission. Common scenarios include unauthorised reproduction of photographs, articles, software code, designs, music, and videos. A Letter Before Action in a copyright case identifies the protected work, describes the infringing act, and demands removal of the infringing material.

Passing off protects unregistered trade marks and goodwill under the common law. A business that has built up goodwill in a name, logo, get-up, or trading style may send a Letter Before Action to a competitor that is misrepresenting its goods or services as being connected with the claimant. The classic trinity for passing off, established in Reckitt and Colman Products Ltd v Borden Inc, requires goodwill, misrepresentation, and damage.

Defamation claims under the Defamation Act 2013 arise when a person publishes a false statement of fact that causes serious harm to the claimant's reputation. Online defamation through social media posts, blog articles, review sites, and forums has dramatically increased the number of defamation Letters Before Action. The letter demands removal of the defamatory material, publication of a correction or apology, and undertakings not to republish.

Harassment under the Protection from Harassment Act 1997 involves a course of conduct (at least two occasions) that amounts to harassment and which the person knows or ought to know amounts to harassment. A Letter Before Action warns the harasser that their conduct is unlawful and that the victim intends to seek an injunction and damages if it continues.

Breach of confidence arises when confidential information (trade secrets, business plans, customer data, technical know-how) is disclosed or used without authorisation. A Letter Before Action demands the return or destruction of confidential materials, cessation of use, and undertakings to maintain confidentiality.

A valid and effective Letter Before Action (cease and desist) for England and Wales must contain several key elements to comply with the Pre-Action Protocols and to maximise the sender's chances of a favourable outcome, whether through voluntary compliance or court proceedings.

Party identification is essential. The letter must clearly identify the sender (the rights holder or complainant) and the recipient (the alleged infringer), including full legal names and addresses. If either party is a limited company, include the Companies House registration number. Identifying the correct legal entity is critical; a letter addressed to the wrong party may be ineffective.

The sender's rights must be clearly stated. For trade mark infringement, reference the UK or international trade mark registration number, the classes of goods or services covered, and the date of registration. For copyright, identify the protected work (title, date of creation, author) and describe how the sender owns or holds an exclusive licence to the copyright. For passing off, describe the goodwill built up through trading under the name or get-up. For defamation, identify the false statement, its publication, and the serious harm caused. For harassment, describe the course of conduct.

The infringing conduct must be described with specificity. State precisely what the recipient has done, when, and where. Include dates, locations, URLs, product descriptions, and any other details that enable the recipient to identify the conduct complained of. Vague allegations undermine the letter's credibility and may not satisfy the Pre-Action Protocol.

Evidence should be summarised. List the evidence supporting the claim, such as screenshots, photographs, purchase receipts, correspondence, expert reports, or witness statements. While it is not necessary to disclose all evidence at this stage, providing a summary demonstrates that the claim is well-founded and encourages the recipient to take the letter seriously.

The demands must be explicit and reasonable. Typical demands include: immediate cessation of the infringing conduct; destruction or delivery up of all infringing materials; written undertakings not to repeat the conduct; payment of damages or an account of profits; and disclosure of the extent of the infringement (for example, the number of infringing copies sold). Each demand should be numbered for clarity.

The response deadline must give the recipient a reasonable period to respond. For intellectual property matters, the Pre-Action Protocol for IP Claims suggests 14 days as a reasonable period in straightforward cases. For more complex matters, 28 days may be appropriate. The letter should state both the period and the calendar deadline date.

The warning of court proceedings must be clear. State which court the proceedings would be issued in (High Court Chancery Division, IPEC, or County Court), the remedies that will be sought (permanent injunction, damages, delivery up, costs), and any intention to apply for interim injunctive relief. Mention that the court may award costs on an indemnity basis for unreasonable conduct.

Alternative dispute resolution should be addressed. Practice Direction — Pre-Action Conduct requires parties to consider ADR before litigation. Offer mediation or direct negotiation and warn that unreasonable refusal to engage in ADR may result in adverse costs consequences under CPR Part 44.

A reservation of rights paragraph should confirm that nothing in the letter waives any of the sender's rights or remedies, whether at law or in equity.