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LEGAL GUIDE | DEFAMATION & REPUTATION PROTECTION

Has Your Reputation Been Attacked? UK Defamation Law Explained for the Public

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Posted: 2nd November 2025
George Daniel
Last updated 18th November 2025
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Has Your Reputation Been Attacked? UK Defamation Law Explained for the Public


Protect Your Name: The Essential Guide to UK Libel, Slander, and the Serious Harm Test

Have you been targeted by false online reviews, a damaging social media post, or an untrue newspaper article? In the UK, the law of defamation—covering both libel and slander—is your shield. This guide breaks down the complex rules of the Defamation Act 2013 to help you understand your rights, what you need to prove, and the powerful defences publishers can use. (For readers in the United States, see our related guide on US defamation law)

Quick Reference: Defamation Basics
What is Defamation?
Libel vs. Slander
The Key Law

🔑 Section 1: The New 'Serious Harm' Rule (The High Bar for Suing)

Before 2014, it was easier to bring a defamation claim. The law changed to protect free speech and stop trivial lawsuits (often called 'libel tourism'). Now, the most important hurdle is proving Serious Harm.

1. The Crucial Test You Must Meet

A statement is not considered defamatory unless its publication has caused, or is likely to cause, serious harm to your reputation.

  • For Individuals: You must show the harm is truly significant—more than just hurt feelings or minor embarrassment. You need evidence the statement substantially lowered how a reasonable person views you.
  • For Businesses (Companies Trading for Profit): The bar is even higher. You must prove the statement has caused, or is likely to cause, serious financial loss. This could include lost contracts, a measurable drop in sales, or a negative impact on share price.

 If you're searching for "how to sue for libel in the UK" or "proving serious financial loss for defamation", this serious harm test is the first thing your lawyer will ask about. Without evidence, your claim will fail immediately.

According to Tom Double, media and communications lawyer at Brett Wilson LLP, ‘under the Defamation Act 2013, a claimant must show that the words complained of were published to a third party, referred to the claimant (directly or by inference), carried a meaning which would lower the claimant in the estimation of right-thinking members of society, and caused or are likely to cause serious harm to the claimant’s reputation.’


📝 Section 2: Libel, Slander, and Where Defamation Lives Online

Most modern defamation happens in the digital world, and the law has adapted.

2.1 The Difference Between Libel and Slander

While both are types of defamation, the distinction is usually about the permanence of the statement:

  • Libel: A permanent record. This includes printed materials, TV broadcasts, films, and—most commonly—social media posts, online comments, and blog articles. You don't need to prove specific financial loss for libel.
  • Slander: A transient statement, typically spoken word. Slander usually requires you to prove specific financial loss unless the words falsely impute certain serious matters (like a serious criminal offence).

2.2 Who Is Responsible for Online Defamation?

This is a common question: can I sue the person who wrote the post, the website, or both?

  • The Author: The person who wrote the defamatory statement is always liable.
  • The Publisher/Website Operator: Websites hosting user-generated content (like forums or comment sections) have a defence under the Defamation Act 2013, Section 5, if they follow a "Notice and Takedown" procedure. However, if you cannot identify the original poster, or the website fails to act on your complaint, the website operator can lose this defence and be held liable.

🛡️ Section 3: The Three Powerful Defences Publishers Use

If a claimant successfully proves the statement is defamatory and caused serious harm, the defendant (the publisher) will almost certainly rely on one of the statutory defences:

3.1 🥇 The Defence of Truth (The Imputation is Substantially True)

This is the strongest defence, replacing the old "justification" rule.

  • The Rule: If you are sued, it is a complete defence to show that the imputation (the core meaning) of the statement is substantially true. The publisher does not have to prove every single word is true, only the essence of the defamatory meaning.
  • Key Takeaway: In UK law, a defamatory statement is presumed false. The burden is on the defendant to prove it is true, not on the claimant to prove it is false.

3.2 🥈 The Defence of Honest Opinion

This protects personal opinions, but not fake facts dressed as opinions.

  • The Rule: The statement must be an opinion, not a statement of fact, and must indicate the basis on which the opinion is held. Crucially, an honest person must have been able to hold that opinion based on the facts that existed at the time of publication.
  • Example: Saying "In my opinion, the food at Restaurant X was bland and the service was rude" is likely protected. Saying "Restaurant X is owned by criminals who use illegal meat" is a factual assertion and is not protected by Honest Opinion unless the publisher can prove it is true.

3.3 🥉 The Defence of Publication on a Matter of Public Interest

This is the journalist's shield, protecting responsible reporting.

  • The Rule: The statement must be part of a report on a matter of public interest, and the defendant must have reasonably believed that publishing it was in the public interest.
  • Relevance: This is the defence that protects investigative journalism and whistleblowers. The court is asked to make an allowance for editorial judgement, weighing the importance of the story against the harm to the claimant's reputation.

❓ What to do if you are a victim of Defamation

Seeking professional legal advice is critical, but the first steps are simple:

  1. Gather Evidence: Immediately take dated screenshots or print copies of the defamatory statements. Do not rely on them staying online.
  2. Identify the Publisher: Note down the author (if identifiable), the website, and the date of publication.
  3. The "Letter of Claim": Before issuing court proceedings, you must send a formal Letter of Claim (often handled by a solicitor) detailing the defamatory statement, its meaning, the serious harm it has caused, and the remedy you seek (e.g., an apology, a retraction, removal, or damages).

Navigating UK libel law requires careful strategy, particularly against a defendant armed with the modern statutory defences. If you feel your reputation has suffered serious harm from a false publication, acting quickly is vital.


What is UK Defamation Law FAQ's

1. What is defamation under UK law?

Defamation in the UK refers to a false statement that damages someone’s reputation. It covers both libel (written or published statements) and slander (spoken words). To be defamatory, the statement must be false, published to others, and cause serious harm to the person’s reputation.

2. What is the “serious harm” test in defamation cases?

Under Section 1 of the Defamation Act 2013, a claim is only valid if the statement has caused, or is likely to cause, serious harm to your reputation. For businesses, the harm must result in serious financial loss.

3. Can I sue for defamation because of a social media post?

Yes. Social media posts, online comments, and digital publications are considered libel because they create a permanent record. If a post contains false claims that damage your reputation, you may have a defamation case.

4. What are the main defences to defamation in the UK?

The three key defences are: Truth, Honest Opinion, and Publication on a Matter of Public Interest. If the publisher can prove any of these, the claim may fail even if the statement was harmful.

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About the Author

George Daniel
George Daniel has been a contributing legal writer for Lawyer Monthly since 2015, covering consumer rights, workplace law, and key developments across the U.S. justice system. With a background in legal journalism and policy analysis, his reporting explores how the law affects everyday life—from employment disputes and family matters to access-to-justice reform. Known for translating complex legal issues into clear, practical language, George has spent the past decade tracking major court decisions, legislative shifts, and emerging social trends that shape the legal landscape.
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