Change of position is a defence to a claim in unjust enrichment which operates to reduce a defendant's liability to the extent to which his or her circumstances have changed as a consequence of an enrichment.
In contract law, unjust enrichment occurs when one person is enriched at the expense of another in circumstances that the law sees as unjust. Where an individual is unjustly enriched, the law imposes an obligation upon the recipient to make restitution, subject to defences such as change of position. Liability for an unjust enrichment arises irrespective of wrongdoing on the part of the recipient. The concept of unjust enrichment can be traced to Roman law and the maxim that "no one should be benefited at another's expense": nemo locupletari potest aliena iactura or nemo locupletari debet cum aliena iactura.
The historical core of the law of unjust enrichment consists of the quasi-contractual actions of money had and received, money paid to the defendant's use, quantum meruit and quantum valebat. These personal common law actions generated an obligation on the part of the defendant to give restitution of a gain acquired at the expense of the plaintiff. This liability was strict and independent of any wrongdoing on the part of the recipient. Change of position provides a defence to a defendant where it would be inequitable to compel him or her to make restitution. The defence was recognised as part of the English law of unjust enrichment by Lord Goff in Lipkin Gorman v Karpnale Ltd [1991] 2 AC 548.
A quasi-contract is a fictional contract recognised by a court. The notion of a quasi-contract can be traced to Roman law and is still a concept used in some modern legal systems.
An action for money had and received to the plaintiff's use is the name for a common law claim derived from the form of action known as indebitatus assumpsit. The action enabled one person to recover money which has been received by another: for example, where a plaintiff paid money to the defendant while labouring under a mistake of fact or where there was a total failure of consideration. The action was a personal action only available in respect of money, rather than other benefits. Where the benefit received by the defendant was services or goods, the appropriate action was a quantum meruit or a quantum valebat, respectively.
Quantum meruit is a Latin phrase meaning "what one has earned". In the context of contract law, it means something along the lines of "reasonable value of services".
Re Diplock or Ministry of Health v Simpson [1951] AC 251 is an English trusts law and unjust enrichment case, concerning tracing and an action for money had and received.
Lipkin Gorman v Karpnale Ltd[1988] UKHL 12 is a foundational English unjust enrichment case. The House of Lords unanimously established that the basis of an action for money had and received is the principle of unjust enrichment, and that an award of restitution is subject to a defence of change of position. This secured unjust enrichment English law as the third pillar of the law of obligations, along with contract and tort. It has been called a landmark decision.
Charles Christopher James Mitchell QC (Hon) is a British legal scholar acknowledged as one of the leading common-law experts on the English law of restitution of unjust enrichment and the law of trusts. He is the author of two leading textbooks and one practitioner's book. He is currently Professor of Law at University College London and Senior Associate Research Fellow at the Institute of Advanced Legal Studies.
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The forms of action were the different procedures by which a legal claim could be made during much of the history of the English common law. Depending on the court, a plaintiff would purchase a writ in Chancery which would set in motion a series of events eventually leading to a trial in one of the medieval common law courts. Each writ entailed a different set of procedures and remedies which together amounted to the "form of action".
The law of restitution is the law of gains-based recovery. It is to be contrasted with the law of compensation, which is the law of loss-based recovery. When a court orders restitution it orders the defendant to give up his/her gains to the claimant. When a court orders compensation it orders the defendant to pay the claimant for his or her loss.
Assumpsit, or more fully, the action of assumpsit, was a form of action at common law. The origins of the action can be traced to the 14th century, when litigants seeking justice in the royal courts turned from the writs of covenant and debt to the trespass on the case.
Failure of consideration is a technical legal term referring to situations in which one person confers a benefit upon another upon some condition or basis ("consideration") which fails to materialise or subsist. It is also referred to as "failure of basis". It is an 'unjust factor' for the purposes of the law of unjust enrichment. Where there is a "total failure of consideration" the claimant can seek restitution of the benefit by bringing an action in unjust enrichment against the defendant. Historically speaking, this was as a quasi-contractual claim known as an action for money had and received to the plaintiff's use for a consideration that wholly failed. The orthodox view is that it is necessary for any relevant contract to be ineffective, for example because it is discharged for breach, void ab initio or frustrated. However, it will be available on a subsisting contract where it does not undermine the contractual allocation of risk.
Andrew Burrows QC (Hon) is a Professor of the Law of England and senior research fellow at All Souls College, Oxford. His work centres on private law, and is the main editor of the compendium English Private Law, the convenor of the advisory group that produced A Restatement of the English Law of Unjust Enrichment as well as textbooks on English contract law.
The English law of unjust enrichment is part of the English law of obligations, along with the law of contract, tort, and trusts. The law of unjust enrichment deals with circumstances in which one person is required to make restitution of a benefit acquired at the expense of another in circumstances which are unjust.
Philip Collins Ltd v Davis [2000] 3 All ER 808 is an English unjust enrichment case, an example of a restitution claim and the change of position defence.
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.
Tracing in English law is a procedure to identify property that has been taken from the claimant involuntarily. It is not in itself a way to recover the property, but rather to identify it so that the courts can decide what remedy to apply. The procedure is used in several situations, broadly demarcated by whether the property has been transferred because of theft, breach of trust, or mistake.
Knowing receipt is an English trusts law doctrine for imposing liability on people who receive property that belonged to a trust, or was held by a fiduciary, and knew that it been given to them in breach of trust. To be liable for knowing receipt, the claimant must show, first, a disposal of his trust assets in breach of fiduciary duty; second, the beneficial receipt by the defendant of assets which are traceable as representing the assets of the claimant; and third, knowledge on the part of the defendant that the assets he received are traceable to a breach of fiduciary duty.
Foskett v McKeown [2000] UKHL 29 is a leading case on the English law of trusts, concerning tracing and the availability of proprietary relief following a breach of trust.
Moses v Macferlan (1760) 2 Bur 1005 is a foundational case in the law of restitution holding that in certain circumstances such as when money is paid by mistake, for failed consideration or under oppression; the law will allow the money to be recovered.
The local authorities swaps litigation refers to a series of cases during the 1990s under English law relating to interest rate swap transactions entered into between banks and local authorities. The House of Lords ruled that such transactions were unlawful. As a result of the decision over 200 separate actions were filed as hundreds of interest rate swap contracts had to be unwound by the courts at great expense.
Barclays Bank Ltd v W J Simms, Son and Cooke (Southern) Ltd [1980] 1 QB 677, [1979] 3 All ER 522 was a decision of the High Court of Justice relating to the recovery of a payment mistakenly made by a bank after the customer had countermanded the cheque.
Goff and Jones on the Law of Unjust Enrichment is the leading authoritative English law textbook on restitution and unjust enrichment (ISBN 978-1847-039101). It is presently in its ninth edition. It is published by Sweet & Maxwell and forms part of the Common Law Library.
Barclays Bank plc v Quincecare Ltd [1992] 4 All ER 363 is a judicial decision of High Court of Justice of England and Wales in relation to the banker-customer relationship, and in particular in connection with the bank's duties in relation to payment instructions which give rise, or ought to give rise, to a suspicion of fraud.