Defamation Injunctions UK: How to Stop Someone Publishing False Statements

An injunction is one of the most powerful remedies in defamation law — a court order that can compel a defendant to remove content immediately or stop a publication before it occurs. For clients who need urgent action, injunctions are often the first call. This guide explains how they work, what the courts require, and what to expect.

What Is a Defamation Injunction?

A defamation injunction is a court order that either:

• Restrains future publication — preventing a defendant from publishing or repeating a defamatory statement (a "pre-publication" or "quia timet" injunction); or
• Requires removal of existing content — ordering a defendant to take down or delete defamatory material already published.

Injunctions can be obtained at any stage of proceedings. In urgent cases, they can be granted on the same day an application is made — sometimes within hours of a solicitor filing the papers.

Interim vs Final Injunctions

An interim injunction is a temporary order made at an early stage in proceedings, before the full merits of the case have been heard. It is designed to preserve the status quo and prevent harm while the case progresses. An interim injunction remains in force until a full trial or until the parties reach agreement.

A final injunction is granted at the conclusion of a successful defamation claim. It permanently prohibits the defendant from republishing the defamatory material. Breach of either type of injunction is punishable as contempt of court, which can result in imprisonment or an unlimited fine.

The American Cyanamid Test: What Courts Consider

When deciding whether to grant an interim injunction, courts apply the principles in American Cyanamid Co v Ethicon Ltd [1975] AC 396:

1. Is there a serious question to be tried? The claimant must show there is a real issue, not a trivial or frivolous one.
2. Would damages be an adequate remedy? If money alone could adequately compensate the harm, courts are less likely to grant an injunction. In defamation, where reputational harm is often irreversible, this frequently favours granting one.
3. Does the balance of convenience favour granting the injunction? Courts weigh the harm to the claimant if the injunction is refused against the harm to the defendant if it is granted.

In defamation cases specifically, courts are cautious about restraining publication because of the right to freedom of expression under Article 10 of the European Convention on Human Rights. Where a defendant intends to plead truth, courts will generally refuse to grant an injunction — the rationale being that if the statement is true, the public has a right to know it.

Without-Notice Applications

In genuine emergencies — for example, where a publication is imminent and cannot be stopped by other means — a claimant can apply for an injunction without notice to the defendant (sometimes called "ex parte"). The court can grant such an order based on the claimant's evidence alone, but the defendant must be given the opportunity to challenge it at a return hearing, usually within a few days.

Without-notice applications carry a duty of full and frank disclosure: the claimant must draw the court's attention to any relevant facts that favour the defendant, even if unhelpful to the claimant's own case. Failure to do so can lead to the injunction being discharged and a costs award against the claimant.

Cross-Undertaking in Damages

As a condition of granting an interim injunction, the court will almost always require the claimant to give a cross-undertaking in damages. This is a promise to compensate the defendant for any loss suffered if the injunction turns out to have been wrongly granted. If the claimant ultimately loses the case, they may be liable for the defendant's losses during the period the injunction was in force.

Claimants should be aware that this undertaking is taken seriously — it is not merely theoretical. In some cases, courts require financial security to be provided (such as paying funds into court) before the injunction is granted.

Injunctions Against Platforms and Intermediaries

Where defamatory content is hosted by a third-party platform (such as Google, X/Twitter, or a hosting company), injunctions can sometimes be directed at the platform as well as or instead of the original publisher. This is particularly relevant where:

• The original publisher is anonymous and cannot yet be identified.
• The publisher is outside the jurisdiction and cannot easily be served.
• The platform has been notified of the defamatory content and has failed to act.

A Norwich Pharmacal Order can also be sought simultaneously to identify the anonymous publisher while the injunction addresses the content itself.

Costs and Timelines

The cost of obtaining an interim injunction varies significantly depending on the complexity of the matter, whether it is contested, and whether a without-notice application is required. As a rough guide:

• Urgent without-notice application: This typically involves significant solicitor and potentially barrister time over a compressed period — costs of several thousand pounds upwards are realistic.
• Return hearing (contested): If the defendant contests the injunction at the return hearing, costs increase significantly.
• Outcome on costs: If the injunction is maintained and the underlying claim succeeds, the defendant will usually be ordered to pay a significant portion of the claimant's costs.

In terms of timelines, emergency without-notice injunctions can be obtained on the day of application. Return hearings are usually listed within days. Full trials in defamation cases typically take 12–24 months.

Related reading: How to remove defamatory content from the internet | What evidence do you need for a defamation claim? | How defamation cases settle out of court