Ann Henderson was an embryologist at GCRM Ltd, a fertility clinic in Glasgow. Between August 2019 and August 2021 she made a series of protected disclosures about staffing issues to managers. By February 2022 she had been dismissed — ostensibly for misconduct. The employment tribunal found that the protected disclosures had a "material influence" on her dismissal but were not the sole or principal reason. That finding produced a web of appeals and cross-appeals which Lord Fairley (President) resolved in Henderson v GCRM Ltd and others [2025] EAT 136 — a judgment that clarifies the architecture of whistleblowing detriment liability and, in the process, puts real flesh on the bones of Timis v Osipov.
The Factual Architecture
Three respondents mattered. The first (GCRM Ltd) was the employer. The second (the line manager) had initiated and driven the disciplinary process, motivated — the tribunal found — by Henderson's protected disclosures. He had wanted her out by negotiated termination; when she refused, he commenced formal disciplinary proceedings.
The third respondent — a more senior manager employed by a different company in the group — had taken over the disciplinary hearing at short notice when the date changed. She had joined the group only weeks before the hearing, knew nothing of the disclosure history, and genuinely believed Henderson was guilty of misconduct. She was the person who actually dismissed her.
The tribunal found that the second respondent had been a "key influence" on the third respondent — extensively informing and guiding the process, shaping the investigation, and having his motivations "filter through" into her decision. The third respondent had relied heavily on materials prepared under the second respondent's direction.
The question was whether any of that could found liability under sections 47B and 103A of the Employment Rights Act 1996.
The Statutory Architecture: Timis v Osipov Revisited
To understand what Henderson decides, you need to understand what Timis v Osipov [2019] ICR 655 established — and why it remains controversial enough to have generated a Court of Appeal call for legislative reform as recently as December 2025 (see Rice v Wicked Vision Ltd and individual liability in whistleblowing cases).
The structure of section 47B ERA 1996 is this. Subsection (1) gives workers a right not to be subjected to detriment by their employer on the ground of protected disclosure. Subsection (2) provides that where the detriment amounts to dismissal of an employee, subsection (1) does not apply — that situation is dealt with exclusively by section 103A (automatically unfair dismissal). Subsections (1A)–(1E), inserted by the Enterprise and Regulatory Reform Act 2013, create a separate and parallel regime: personal liability for a fellow worker or agent who subjects the claimant to detriment on the ground of protected disclosure. Where that personal liability is established, subsection (1B) deems the detriment also done by the employer.
In Timis, Lord Justice Underhill confirmed that the s.47B(2) exclusion only bars claims against employers under s.47B(1) — it does not prevent employees bringing a claim for the detriment of dismissal against a co-worker under s.47B(1A), nor does it prevent the employer being vicariously liable for that co-worker's act under s.47B(1B). This is, on its face, an important jurisdiction: a claimant dismissed by a motivated co-worker can pursue that individual personally and pursue the employer vicariously, in addition to — or instead of — a s.103A claim.
The Court of Appeal in Rice v Wicked Vision [2025] EWCA Civ 1466 confirmed this remains the law but noted plainly that, had they not been bound by Timis, they would have departed from it. The scheme is, in Laing LJ's view, incoherent. Henderson adds a further layer of precision to how that incoherence is managed — without resolving it.
Issue One: Section 103A and the Jhuti Question
In Royal Mail Group Ltd v Jhuti [2020] ICR 731, the Supreme Court held that, in limited circumstances, the principal reason for a dismissal can be the making of a protected disclosure even where the innocent dismissing officer did not know about it. The mechanism is deliberate manipulation: a person senior to the dismissed employee deliberately manipulates evidence or conceals the real reason for dismissal behind a fictitious one, such that the innocent dismissing officer adopts the manipulated or fictitious reason in good faith. In such a case, the tribunal should look past the fictitious reason to the real one.
The tribunal had found that the second respondent's motivation had "filtered through" to the third respondent's decision and constituted a "material influence" on her dismissal. But it had not found — and had not clearly asked — whether the second respondent had manipulated evidence or invented a fictitious pretext. Its reconsideration reasons acknowledged the Jhuti framework at para 33 but concluded at para 34 that the protected disclosures were not "the main" reason in the third respondent's mind — a material causal factor but not the principal one.
Lord Fairley held that the tribunal had failed to engage with the Jhuti questions. Once Jhuti was raised as a live issue, the tribunal was required to make clear findings on whether the second respondent had improperly manipulated the process or created a false pretext — and if so, what that manipulation consisted of and what part it ultimately played in the third respondent's decision. The tribunal's reasons hinted at manipulation without resolving the issue.
However — and this matters — Lord Fairley did not accept that proper engagement with Jhuti would inevitably have produced a finding for the claimant on s.103A. The tribunal had made findings at ET para 217 consistent with the second respondent genuinely believing Henderson was guilty of misconduct. A tribunal which had fully addressed the Jhuti questions might have rejected manipulation entirely. The s.103A complaint was accordingly remitted to the same tribunal to apply Jhuti properly.
Issue Two: What Timis Does Not Do — Composite Liability Under s.47B(1A)
Timis confirms that a co-worker can be personally liable for the detriment of dismissal under s.47B(1A). Henderson answers the question that Timis left open: liable on what basis?
The respondents cross-appealed on the question of whether the employment tribunal had erred in applying the Jhuti approach to s.47B(1A) detriment claims. Specifically: could a "composite approach" to liability — combining the innocent third respondent's act of dismissal with the tainted second respondent's motivation — found personal liability against the third respondent under s.47B(1A)?
The authority against composite liability under the personal liability provisions was already clear. In Reynolds v CLFIS (UK) Ltd [2015] ICR 1010, the Court of Appeal rejected composite liability in age discrimination, holding it incompatible with the personal liability scheme for a co-worker to be held liable who personally acted innocently. In Malik v Cenkos Securities plc UKEAT/100/17, Choudhury J (President) applied Reynolds directly to s.47B(1A): the personal liability provisions cannot impose liability on an innocent individual by attributing to them the unlawful motivation of another. In William v Lewisham and Greenwich NHS Trust [2024] ICR 1065, Bourne J declined to depart from Malik in light of Jhuti, noting that the Supreme Court's decision in Jhuti turned on the meaning and purpose of s.103A — not s.47B.
Lord Fairley agreed with all three. Parliament cannot have intended to impose unlimited liability upon innocent individuals who have not personally been motivated by a proscribed reason. The purposive approach in Jhuti reflected the need to provide an effective remedy for whistleblowers — but that remedy is available without ever having to impose liability on a wholly innocent party. The employer is reached through s.47B(1B) once the motivated co-worker's personal liability is established; s.103A reaches the employer directly. None of this requires the composite approach.
What Timis creates — and Henderson refines — is therefore a narrower jurisdiction than it might initially appear. A co-worker is personally liable under s.47B(1A) only for detriments they personally imposed, motivated by the claimant's protected disclosures. The innocent decision-maker who dismisses in good faith, having been manipulated by a motivated colleague, escapes personal liability. The motivated colleague escapes liability for the act of dismissal unless they personally took that decision.
The tribunal had erred in applying Jhuti to the s.47B(1A) complaints. The complaints against the first and third respondents under ss.47B(1A) and (1B) were dismissed by substitution.
Issue Three: The Scope of "Dismissed" in Section 47B(1A)
The claimant's third ground was that the second respondent could be liable for the detriment of dismissal under s.47B(1A) because his involvement had caused or contributed to her dismissal by the third respondent. "Dismissed" should be read widely: caused to be dismissed.
Lord Fairley rejected this at para 43. Construing "dismissed" to include action that caused or contributed to dismissal by a different manager would blur the distinction between pre-dismissal detriment and dismissal itself. The claimant had pleaded only that the detriment imposed by the second respondent was dismissal — that he had instructed the third respondent to dismiss her. The tribunal rejected that factual contention. She had not pleaded a different case of pre-dismissal detriment against the second respondent. The only person who dismissed her was the third respondent.
This is the sharpest practical limit Henderson places on the Timis jurisdiction: a practitioner who wishes to pursue the motivated manipulator for a dismissal detriment must either establish that person was the actual decision-maker, or plead discrete pre-dismissal detriments against them — and plead them in time.
The IDS Gloss: Where Jhuti May Yet Apply
IDS Employment Law Handbook, Volume 17, Chapter 5, para 5.70 was updated in October 2025 specifically to address Henderson. The update confirms the EAT's conclusions — composite approach impermissible under s.47B(1A); Jhuti does not apply to individual co-worker detriment claims — but identifies a route that Henderson expressly left open:
"The EAT commented that there was no obvious reason in principle why Jhuti could not, in appropriate circumstances, apply to a claim of non-dismissal detriment against an employer under S.47B(1). A finding of liability in such circumstances would not impose liability on an innocent decision maker."
This matters. Jhuti is excluded from s.47B(1A) (personal co-worker liability) and from s.47B(1) where the detriment is dismissal (excluded by s.47B(2) and channelled to s.103A). But for non-dismissal detriments, the employer's direct liability under s.47B(1) is untouched by Henderson. If a motivated manager manipulated an innocent manager into imposing non-dismissal detriments — for example, a demotion, an exclusion from work, a disciplinary sanction — a Jhuti-type analysis of the employer's liability under s.47B(1) would impose no injustice on the innocent individual. No Jhuti barrier applies. The IDS gloss flags this as unexplored territory.
Practical Consequences
For claimants in a tainted information scenario, the viable routes following Henderson are: (a) s.103A against the employer — with a Jhuti analysis now remitted to tribunal and potentially available against the employer in other cases where the manipulation question is properly addressed; (b) s.47B(1) against the employer for non-dismissal detriments, potentially on Jhuti-extended causation; and (c) s.47B(1A) against the individual co-worker only for the detriments they personally imposed and were personally motivated by the disclosures to impose. The detriment of dismissal under s.47B(1A) lies against the person who actually dismissed — not the person who shaped the process.
For respondents, Henderson provides a clear answer: an individual respondent who took their decision genuinely, without knowing about the disclosures, cannot be held personally liable on a composite basis however significant the tainted manager's influence was. The composite approach is dead in the s.47B(1A) context.
The outstanding question — whether a full Jhuti analysis on remission will produce a different result on the s.103A complaint — remains open. The tribunal made no express finding that the second respondent manipulated evidence or invented a fictitious pretext. That question is now squarely before it.