Summary
A fiduciary must account for an unauthorised profit made from, or sufficiently connected with, the fiduciary relationship. The obligation can extend to profits made after the relationship ends.
Factual causation may help identify whether the profit arose from the fiduciary position. English law does not, however, permit the fiduciary to retain the profit by showing that it could have been made without a breach, through earlier resignation, or with consent that might have been obtained. Only actual, fully informed consent provides a defence.
The court declined to depart from longstanding authority. The strict rule protects single-minded loyalty and deters conflicts. Any disproportionate effect may be moderated by a discretionary equitable allowance for the fiduciary’s work, skill and risk.
Factual background
The individual appellants learned of and worked on a lucrative asset-recovery opportunity while acting in fiduciary roles for entities whose claims were later held by the respondents. Before leaving those roles, they took disloyal preparatory steps to obtain the opportunity for themselves. After resigning, they supplied the recovery services through a new structure and earned substantial profits.
Cockerill J found breaches of fiduciary duty and ordered an account of net profits of US$179 million, subject to a 25% equitable allowance, producing an award of approximately US$134 million plus interest. The Court of Appeal dismissed the appeal in [2023] EWCA Civ 305.
The Supreme Court considered whether to depart from Regal (Hastings) Ltd v Gulliver and Boardman v Phipps by introducing a common-law “but for” test under which a fiduciary could retain profits that would hypothetically have been earned without a breach.
Held
The appeal was dismissed unanimously. Lord Briggs gave the leading judgment, with which Lord Reed, Lord Hodge and Lord Richards agreed. Lord Leggatt, Lord Burrows and Lady Rose delivered separate concurring judgments.
The majority declined to depart from Regal (Hastings) Ltd v Gulliver and Boardman v Phipps. A fiduciary’s undertaking of single-minded loyalty entails a strict obligation to account for unauthorised profits made from, out of, or sufficiently connected with the fiduciary relationship. Fully informed consent is the relevant defence. Knowledge of the profit without consent is insufficient.
The necessary connection can survive termination of the relationship. A former fiduciary will ordinarily be accountable where post-termination profits owe their existence to a significant extent to fiduciary property, information, an opportunity or another advantage, or to conflicting activity begun while the relationship continued. The inquiry examines what actually occurred. It does not construct a hypothetical world in which the fiduciary resigned earlier, sought consent, or otherwise avoided the breach.
Lord Briggs held that factual causation in the broad sense may assist in identifying the connection between the fiduciary position and the profit. This differs from the common-law “but for” test. The latter would undermine the prophylactic purpose of the profit and conflict rules by permitting the fiduciary to rely on hypothetical lawful alternatives.
The strict rule was neither obsolete nor unjustified. Its purpose remains to deter fiduciaries from entering conflicting activities without prior informed consent. Equitable compensation was not an appropriate analogy because it responds to loss, whereas an account strips unauthorised gain. A discretionary equitable allowance for work, skill and risk provides the appropriate means of avoiding disproportionate injustice.
Lord Burrows agreed that an account could be analysed as a remedy for breach, but concluded that its purpose still excludes a lawful-alternative counterfactual. Lady Rose considered that any relaxation for modern commercial relationships would have wide statutory and commercial consequences and was a matter for Parliament.
Lord Leggatt adopted a different analysis. He regarded an account as a remedy for misuse of property, information or opportunity and considered that ordinary “but for” causation applies. On his formulation, however, the relevant non-breach scenario excluded the appellants’ exploitation of the opportunity. They would consequently have made none of the disputed profits, so the appeal still failed.
The court’s approach to earlier authorities
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Appellate history
- United Kingdom Supreme Court: The appeal was dismissed unanimously. The court declined to depart from the governing House of Lords authorities.
- Court of Appeal: In [2023] EWCA Civ 305 , reported at [2023] Bus LR 646, the court dismissed the appellants’ appeal from the liability and accounting decisions.
- High Court, Commercial Court: Cockerill J found breaches of fiduciary duty at the liability trial and subsequently ordered an account of US$179 million in net profits, subject to a 25% equitable allowance, producing an award of approximately US$134 million plus interest.
Appeal route
- Appealed from[2023] EWCA Civ 305This appealappeal dismissed unanimously
- This judgment [2025] UKSC 10 United Kingdom Supreme Court
Key cases cited
The 30 most senior of 33 authorities cited.
- Lifestyle Equities CV and another v Ahmed and another [2024] UKSC 17
- In the matter of an application by Rosaleen Dalton for Judicial Review (Northern Ireland) [2023] UKSC 36
- BTI 2014 LLC v Sequana SA and others [2022] UKSC 25
- Lowick Rose LLP v Swynson Ltd and another [2017] UKSC 32
- AIB Group (UK) plc v Mark Redler & Co [2014] UKSC 58
- FHR European Ventures LLP and others v Cedar Capital Partners LLC [2014] UKSC 45
- Austin v Mayor and Burgesses of the London Borough of Southwark [2010] UKSC 28
- Target Holdings Ltd v Redferns [1996] AC 421
- Phipps v Boardman (Boardman v Phipps) [1967] 2 AC 46
- Regal (Hastings) Ltd v Gulliver [1967] 2 AC 134
- Gray v Global Energy Horizons Corporation [2020] EWCA Civ 1668
- Parr v Keystone Healthcare Ltd & Ors [2019] EWCA Civ 1246
- Foster Bryant Surveying Ltd v Bryant & Anor [2007] EWCA Civ 200
- Murad & Anor v Al-Saraj & Anor [2005] EWCA Civ 959
- Bristol and West Building Society v Mothew [1998] Ch 1
- Halifax Building Society v Thomas [1996] Ch 217
- Ancient Order of Foresters in Victoria Friendly Society Ltd v Lifeplan Australia Friendly Society Ltd [2018] HCA 43
- Ultraframe (UK) Ltd v Fielding [2005] EWHC 1638 (Ch)
- Hui Chun Ping v Hui Kau Mo [2024] HKCFA 32
- UVJ v UVH [2020] SGCA 49
- CMS Dolphin Ltd v Simonet [2001] 2 BCLC 704
- United Pan-Europe Communications NV v Deutsche Bank AG [2000] 2 BCLC 461
- Warman International Ltd v Dwyer (1995) 182 CLR 544
- Island Export Finance Ltd v Umunna [1986] BCLC 460
- Swain v The Law Society [1982] 1 WLR 17
- Canadian Aero Service Ltd v O’Malley [1974] SCR 592
- Industrial Development Consultants Ltd v Cooley [1972] 1 WLR 443
- Gray v. New Augarita Porcupine Mines [1952] 3 DLR 1
- Bray v Ford [1896] AC 44
- Aas v Benham [1891] 2 Ch 244
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Cases citing this case
24 later cases · 19 positive · 3 neutral · 1 caution · 1 negative
Most senior citing decisions:
- Saxon Woods Investments Limited and others v Francesco Costa [2026] UKSC 21 approved
- A and 6 others v C and 13 others [2026] UKPC 11 applied
- Mitchell and another (Joint Liquidators of MBI International & Partners Inc (In Liquidation)) v Sheikh Mohamed Bin Issa Al Jaber [2025] UKSC 43 applied
- Stevens v Hotel Portfolio II UK Ltd (In Liquidation) and another [2025] UKSC 28
- GI Globinvestment Limited & Anor v XY ERS UK Limited [2026] EWCA Civ 1248
- Titanium Capital Investment Limited & Anor v Jonathan Hughes & Ors [2026] EWCA Civ 976
- Lufthansa Technik AG v Astronics Advanced Electronic Systems & Anor [2026] EWCA Civ 964
- Guorui Song & Anor v Kes Smith & Ors [2026] EWCA Civ 719
- Saxon Woods Investments Limited v Francesco Costa [2025] EWCA Civ 708
- Hipgnosis Music Limited v Merck Mercuriadis & Ors [2026] EWHC 1500 (Ch)
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