The Honest Opinion Defence: How It Protects Online Reviews

Online reviews are the lifeblood of modern consumer decision-making. But when a negative review crosses from opinion into false statements of fact, the reviewer may face a defamation claim. The honest opinion defence under section 3 of the Defamation Act 2013 is the primary shield for reviewers — but it has strict requirements that many people misunderstand.

What Is the Honest Opinion Defence?

The honest opinion defence (formerly "fair comment") protects statements that are recognisably expressions of opinion rather than assertions of fact. Under section 3 of the Defamation Act 2013, three conditions must be satisfied:

1. The statement complained of was a statement of opinion (not fact)
2. The statement indicated, whether in general or specific terms, the basis of the opinion
3. An honest person could have held the opinion on the basis of any fact which existed at the time or any privileged statement published before

The defence fails if the claimant shows that the defendant did not actually hold the opinion — i.e., that it was dishonest.

Fact vs Opinion: The Critical Distinction

The most important question in any honest opinion case is whether the statement is one of fact or opinion. This distinction determines whether the defence is even available:

• Fact: "This restaurant has cockroaches in the kitchen" — this is a verifiable factual assertion. If false, no honest opinion defence applies
• Opinion: "I thought the food was terrible and the service was the worst I've ever experienced" — this is a subjective evaluation. The honest opinion defence can apply
• Mixed: "This builder did a shoddy job — the walls aren't straight and the plumbing leaks" — this contains both factual assertions and opinion. The factual elements must be true for the defence to succeed

Courts look at how the "ordinary reasonable reader" would understand the statement. Context matters enormously — a review on Trustpilot is more naturally read as opinion than a statement on a news website.

How This Applies to Online Reviews

Online review platforms are designed for subjective assessments, which gives reviewers a contextual advantage. However, common mistakes that lose the protection of honest opinion include:

• Making false factual allegations (e.g., falsely claiming a business committed fraud)
• Failing to indicate the basis of the opinion — a review that says "this company is corrupt" without explaining why provides no factual basis
• Posting reviews for businesses you've never actually used (the opinion must be honestly held based on real experience)
• Coordinated fake review campaigns — these are inherently dishonest and the defence cannot apply

The "Basis" Requirement

Section 3(4) requires that the statement of opinion must indicate, "whether in general or specific terms, the basis of the opinion." This is a relatively low threshold — the reader does not need to know every underlying fact, but must have enough context to understand that an opinion is being expressed and broadly what it is based on.

For online reviews, the review itself typically provides the basis: the reviewer's experience with the product or service. A one-star review saying "Awful experience, rude staff, long wait times" implicitly indicates the basis — the reviewer's visit.

When Businesses Can Sue Despite the Defence

Businesses can overcome the honest opinion defence in several scenarios:

• The review contains provably false statements of fact
• The reviewer never used the business (cannot honestly hold the opinion)
• The review is part of a malicious campaign by a competitor
• The reviewer has been paid to post a negative review

For businesses dealing with fake reviews, our guide on Google review defamation explains the removal process in detail.

Key Takeaways

• The honest opinion defence protects genuine expressions of opinion in online reviews
• The critical distinction is between fact (verifiable) and opinion (subjective)
• Reviewers must indicate the basis of their opinion, even in general terms
• False factual allegations, fake reviews, and competitor campaigns are not protected
• Context matters — review platforms are naturally read as opinion