Expert witnesses play a vital role in many UK defamation cases, providing specialist knowledge that helps the court understand technical, financial, or industry-specific issues.
When Are Expert Witnesses Needed?
- Quantum of damages: Forensic accountants calculating financial losses
- Psychiatric evidence: Assessing mental health impact of defamatory statements
- Digital forensics: Tracing the origin and spread of online content
- Industry context: Explaining how statements would be understood in a particular industry
- Reputation measurement: PR experts assessing reputational damage
The Court's Permission
Under the Civil Procedure Rules, expert evidence requires the court's permission. The court considers whether evidence is reasonably required, proportionate, and likely to assist. In lower-value claims, the court may limit evidence to a single joint expert.
Forensic Accounting in Defamation
In business defamation cases, forensic accountants can quantify lost revenue, reduced contract values, and lost business opportunities — crucial for satisfying the "serious financial loss" requirement for corporate claimants.
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Digital Forensic Evidence
In online defamation cases, digital forensic experts can trace IP addresses, analyse metadata, identify the origin of anonymous posts, and quantify the reach of defamatory content. This is particularly valuable in Norwich Pharmacal applications.
Related reading: How to prove defamation | Defamation compensation | Anonymous online defamation
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