Rai v Advantage Insurance [2026] EWHC 784 (KB)

How the High Court Assesses the Reliability of Witnesses

The claimant was struck by a car while crossing a slip road at night and suffered a traumatic brain injury so serious that she could not give evidence herself. Her sister, who was present at the scene, was the claimant’s principal witness.

The judgment’s most lasting value is what it teaches about how courts assess the reliability of witnesses.

The judge found that both witnesses gave their evidence “honestly and without embellishment.” Neither was lying. Yet she treated their accounts very differently.

The judge’s reasoning was that the collision unfolded in seconds, in darkness, and in front of a witness who went into immediate shock. Those conditions, speed, poor visibility, and acute trauma, are precisely the ones that corrupt memory without the witness knowing it. The sister sincerely believed she had seen the claimant look both left and right before stepping into the road. The judge rejected that evidence. She found the claimant had looked, but in the wrong direction. The sister’s “genuinely held but mistaken belief” was a product of trauma, not deception.

By contrast, the driver was accepted in full because he acknowledged the limits of his own memory, made appropriate concessions, and his evidence aligned with the objective record: body worn footage, physical evidence, and police reconstruction footage.

This judgment reminds of three wider general principles relating to witness assessment, beyond merely personal injury:

First, honesty is not the same as accuracy. A witness who is telling the truth as they know it can still be wrong about what actually happened, especially when the event was fast, dark, or frightening.

Second, inconsistencies do not necessarily mean dishonesty. The judge identified several problems with the sister’s account but noted that none of them suggested an attempt to mislead. They simply reduced the weight she could place on the evidence about precise positioning. She treated it “with caution, unless corroborated.”

Third, corroboration is everything. The objective record, footage, documents, physical evidence, is the anchor against which honest but potentially unreliable testimony must be tested.

Litigators, workplace investigators, and decision makers of all kinds need to keep this in mind. A witness who is consistent, credible, and plainly sincere is not automatically right about the detail that decides the case. Memory is a reconstruction, not a recording. That is what makes litigation risky even when your witness believes every word they are saying, and it is why thorough investigation always means testing the account against the objective evidence, not simply accepting it.

Rai v Advantage Insurance [2026] EWHC 784 (KB)

Judgment: https://lnkd.in/efsZadse