Restitution in English law
The English law of Restitution is the law of gain-based recovery. Its precise scope and underlying principles remain a matter of significant academic and judicial controversy. Broadly speaking, the law of restitution concerns actions in which one person claims an entitlement in respect of a gain acquired by another, rather than compensation for a loss.
Many academic commentators have sought to impose structure upon the law of restitution by searching for a common rationale and constructing taxonomies of the various types of claim. Whether such frameworks can account for the diverse range of restitutionary claims remains a controversial question. The implications of such frameworks for the relationship between law and Equity has often been a significant flashpoint in academic and judicial debate.
As the law currently stands, the law of restitution can be usefully divided into (at least) three broad categories:
- Restitution for unjust enrichment
- Restitution for wrongs
- Restitution to vindicate property rights
Outside of these categories exist a range of doctrines which also provide restitutionary or analogous remedies. Academic commentators have sought to rationalise these in terms of unjust enrichment, with various degrees of success. It is now generally accepted that unjust enrichment has a part to play in the doctrine of subrogation. Actions for recoupment (historically speaking, an action for money paid to the defendant's use) and contribution have also been said to reverse unjust enrichment. Certain statutory frameworks providing for restitutionary remedies have been said to rest on the principle of unjust enrichment.
Restitution for unjust enrichment
Where one person has acquired a benefit at the expense of another in circumstances which are unjust and there are no applicable defences, the law imposes an obligation upon the latter person to make restitution. In short, a claimant will have a prima facie action where:
- The defendant has been enriched.
- This enrichment has been at the claimant's expense.
- This enrichment at the claimant's expense is unjust.
- There is no applicable defence.
The historical core of restitutionary claims to reverse unjust enrichment lies in the law of quasi-contract. These were personal common law actions. In English law, the doctrinal basis of such claims is now said to be unjust enrichment. With this abstraction has come attempts - with varying degrees of success and controversy - to expand the explanatory power of the principle of unjust enrichment. Examples of the types of claim now falling within the modern English law of unjust enrichment include:
- Actions to recover mistaken payments
- Actions to recover money paid on a total failure of consideration
- Actions to recover money paid under duress
- Actions for the reasonable value of services provided to the defendant (quantum meruit)
- Actions for the reasonable value of goods provided at the request of the defendant (quantum valebat)
- Actions to recover money paid to the defendant's use (recoupment claims)
Restitution for wrongs
Restitution for wrongs refers to a remedy where a gain can be taken away (or 'stripped', 'disgorged', etc.) from a defendant who has committed a wrong, either a tort, breach of contract, breach of fiduciary duty or breach of confidence.
- United Australia Ltd v Barclays Bank Ltd
- Phillips v Homfray (1883)
- Edwards v Lee's Administrators
- Penarth Dock Engineering Co Ltd v Pounds
- Bracewell v Appleby
- Stoke-on-Trent City Council v W&J Wass Ltd
- Ministry of Defence v Ashman
- Jaggard v Sawyer
Intellectual property torts
- Colbeam Plamer Ltd v Stock Affiliates Pty Ltd
- Patents Act 1977 ss 61-62
- Copyright, Designs and Patents Act 1988 ss 96-97, 191I-J, 229 and 233
- Halifax Building Society v Thomas
- Law Commission, Aggravated, Exemplary and Restitutionary Damages (1997) No 247
- Draft Bill clauses 12(1), (5) and 15(6)
Breach of contract
- Wrotham Park Estate Co Ltd v Parkside Homes Ltd
- Attorney General v Blake
- Experience Hendrix LLC v PPX Enterprises Inc
- World Wide Fund for Nature v World Wrestling Federation Entertainment Inc
Breach of fiduciary duty
- Regal (Hastings) Ltd v Gulliver
- Boardman v Phipps
- Murad v Al-Saraj
- Reading v Attorney-General
- Attorney-General for Hong Kong v Reid
- Daraydan Holdings Ltd v Solland International Ltd
Breach of confidence
- Peter Birks, Unjust Enrichment (2nd ed, 2005) 3-5.
- See generally, Virgo, Principles of the Law of Restitution (3rd ed, 2015); Burrows, Law of Restitution (3rd ed, 2011); Mitchell, Mitchell, Watterson, Goff & Jones Law of Unjust Enrichment (8th ed, 2011); Edelman and Degeling, Equity in Commercial Law (LexisNexis, 2005).
- Early examples: Goff & Jones, The Law of Restitution (1st ed, 1966); Peter Birks, An Introduction to the Law of Restitution (1989). Contemporary accounts: Virgo, Principles of the Law of Restitution (3rd ed, 2015); Burrows, Law of Restitution (3rd ed, 2011); Mitchell, Mitchell, Watterson, Goff & Jones Law of Unjust Enrichment (8th ed, 2011).
- See generally, Edelman and Degeling, Equity in Commercial Law (LexisNexis, 2005).
- See Foskett v McKeown  UKHL 29 and Bank of Cyprus v Menelaou  UKSC 66 for affirmation of the distinction between (a) personal actions to reverse unjust enrichment; and (b) proprietary actions in which a claimant seeks a proprietary remedy in respect of a traceable substitute of property once owned by the claimant. The latter is a case founded on the vindication of the claimant's original (and subsisting) property rights. A prominent supporter of this view has been Professor Graham Virgo (see, e.g., Virgo, Principles of the Law of Restitution (3rd ed, 2015). This view has been criticised, most notably by Professor Andrew Burrows (see, e.g., Burrows, Law of Restitution (3rd ed, 2011).
- See, e.g., Bank of Cyprus v Menelaou  UKSC 66
- See generally, Charles Mitchell, Law of Contribution and Recoupment (OUP, 2003); Mitchell, Mitchell, Watterson, Goff & Jones Law of Unjust Enrichment (8th ed, 2011).
- See, e.g., BP Exploration Co (Libya) Ltd v Hunt (No 2)  2 AC 352, in which Robert Goff J held that the statutory framework dealing with frustration contracts was underpinned by a general principle of unjust enrichment. This has not been without controversy: Virgo, Principles of the Law of Restitution (3rd ed, 2015).
- Lipkin Gorman v Karpnale 
- See generally, Edelman and Degeling, Equity in Commercial Law (LexisNexis, 2005)