The Truth Defence in UK Defamation Law: Section 2 Explained

Truth is a complete defence to a defamation claim. Under section 2 of the Defamation Act 2013, if you can prove that the defamatory statement was substantially true, the claim must fail — regardless of the claimant's reputation or the harm caused. This guide explains how the truth defence works in practice.

The Legal Framework

Section 2 of the Defamation Act 2013 provides:

"It is a defence to an action for defamation for the defendant to show that the imputation conveyed by the statement complained of is substantially true."

This replaced the former common law defence of "justification." The key change was codifying the principle that the defendant bears the burden of proving the statement is true — the claimant does not have to prove it is false.

What "Substantially True" Means

The statement does not need to be true in every minor particular. It must be substantially true — meaning the "sting" or essential meaning of the statement must be accurate. For example:

• Saying someone was "convicted of fraud" when they were actually convicted of a related dishonesty offence may be substantially true
• Saying someone stole "£10,000" when the actual amount was £8,500 is likely substantially true — the sting is the theft, not the precise amount
• But saying someone was "convicted" when they were only charged is not substantially true — the sting is materially different

The Burden of Proof

The defendant must prove, on the balance of probabilities, that the statement is substantially true. This means:

• You must have admissible evidence to support the truth of the statement at the time you file your Defence
• Vague or unsubstantiated allegations will not succeed — you need documentary evidence, witness statements, or other proof
• The standard is the civil standard (balance of probabilities), not the criminal standard (beyond reasonable doubt)

Multiple Imputations

Where a statement conveys two or more distinct defamatory meanings (imputations), section 2(3) provides that the defence does not fail if one or more of the imputations is not shown to be substantially true, provided that the imputation(s) not shown to be true do not seriously harm the claimant's reputation having regard to the truth of the remaining imputations.

For example, if you accused someone of being "a thief and a liar," and you can prove they are a thief but not that they are a liar, the truth defence may still succeed if the "liar" imputation does not cause additional serious harm given the proven truth of the "thief" allegation.

Evidence Strategy

Building a truth defence requires careful evidence preparation:

• Documentary evidence — contracts, emails, financial records, court documents, regulatory findings
• Witness evidence — statements from people who can corroborate the facts
• Expert evidence — where technical matters are in dispute (e.g., financial fraud, medical negligence)
• Disclosure — the court process allows you to obtain relevant documents from the claimant through standard disclosure

Start gathering evidence as soon as you receive a complaint. Evidence can become harder to obtain as time passes, and witnesses' memories fade.

Risks of Pleading Truth

While truth is a complete defence, there are risks to be aware of:

• If you plead truth and fail to prove it, the court may award higher damages because the defence is seen as aggravating the harm
• The truth defence requires you to set out the factual basis for your case in detail, which may reveal your sources
• Costs exposure is significant if the defence fails