Shamoon v Chief Constable of the Royal Ulster Constabulary [2003] UKHL 11

In brief

Chief Inspector Shamoon was stripped of her counselling and appraisal responsibilities for constables following Police Federation representations — a function her male counterparts retained. The House of Lords restored the industrial tribunal's finding of sex discrimination, establishing the definitive test for 'detriment': a reasonable worker would or might take the view that the treatment was to their disadvantage. The HL also clarified the proper analytical approach to the comparator question, favouring an approach that resolves the 'reason why' question first rather than treating the comparator as a threshold gate.

Key provisions

• shamoon-hl-2003-p1 — Definition of detriment — reasonable worker test: A detriment exists if a reasonable worker would or might take the view that the treatment was in all the circumstances to their detriment. It is not necessary to show physical or economic consequence.
• shamoon-hl-2003-p2 — Detriment — materiality threshold: The test of materiality requires that the treatment be of a kind that a reasonable worker would or might regard as disadvantageous in the circumstances in which they thereafter work. An unjustified sense of grievance alone does not suffice.
• shamoon-hl-2003-p3 — Two-stage vs single-question approach to discrimination: Tribunals need not always resolve less favourable treatment (stage 1) before the reason why (stage 2). Where the comparator is disputed, it may be more efficient to ask why the claimant was treated as they were, with the answer resolving the less favourable treatment issue.
• shamoon-hl-2003-p4 — Comparator — same or not materially different circumstances: The statutory comparator must be in the same, or not materially different, circumstances to the claimant. Differences in circumstances which are themselves a product of discriminatory treatment should not be treated as material differences.
• shamoon-hl-2003-p5 — Positional/reputational disadvantage as detriment: Loss of a function that was part of the claimant's normal practice and which reduced her standing among colleagues and those over whom she exercised authority constituted a detriment, even without formal demotion or financial loss.

When relevant

When assessing whether treatment of a trans employee amounts to discrimination — particularly where no direct comparator exists and a hypothetical comparator must be constructed.