Goff & Jones is the leading work on the law of unjust enrichment. Successive editions have played a major role in establishing the central importance of the subject for private and commercial lawyers and developing its key concepts and principles. The text is comprehensive in coverage and written by highly respected scholars who explain all of the rules governing claims in unjust enrichment and discuss how these have been applied through detailed examination of the case-law. The book is frequently cited in courts throughout the Commonwealth and continues to signpost future developments in the field. The new 10th edition is completely up-to-date and contains detailed discussion of important decisions since the last edition. Several chapters have been wholly or substantially rewritten to take account of significant new cases, and their impact on topics including the recovery of benefits from remote recipients, the recovery of benefits transferred on a condition that fails, the recovery of ultra vires payments by public bodies, the limitation rules governing claims in unjust enrichment and interest awards on such claims. The 10th edition deals with the following six key matters in relation to making a claim: Explains how a claim in unjust enrichment can be precluded where a defendant's enrichment is mandated by a statute, judgment, natural obligation, or contract Analyses the principles governing the identification and valuation of enrichment, and explains how these apply to claims for different types of benefit Considers the requirement that a defendant's gain has been acquired at the claimant's expense Discusses the different grounds for restitution: lack of consent and want of authority; mistake; duress; undue influence and unconscionable bargains; failure of basis; free acceptance; necessity; secondary liability; ultra vires receipts and payments by public bodies; etc Examines defences including change of position; ministerial receipt; bona fide purchase; estoppel; counter-restitution impossible; passing on; limitation; legal incapacity; illegality Details the personal and proprietary remedies for unjust enrichment The new edition contains detailed discussion of the following cases of major importance: Investment Trust Companies (in liq.) v HMRC [2018] A.C. 275 (exclusion of unjust enrichment by statute; enrichment acquired "at the claimant's expense"); Swynson Ltd v Lowick Rose LLP (in liq.) [2018] A.C. 313 (enrichment acquired "at the claimant's expense"; subrogation); Littlewoods Retail Ltd v HMRC (No.2) [2018] A.C. 869 (exclusion of unjust enrichment by statute); Prudential Assurance Co Ltd v HMRC [2019] A.C. 929 (enrichment acquired "at the claimant's expense"); Vodafone Ltd v Office of Communications [2020] Q.B. 857 (counterfactual arguments against Woolwich claims); Test Claimants in the FII Group Litigation v HMRC [2022] A.C. 1 (limitation rules governing claims founded on mistake); Test Claimants in the FII Group Litigation v HMRC [2021] 1 W.L.R. 4354 ("netting off" of defendant's gains and losses; interest awards) Pakistan International Airline Corp v Times Travel (UK) Ltd [2021] 3 W.L.R. 727 (lawful act duress). School Facility Management Ltd v Christ the King College [2021] 1 W.L.R. 6129 (counter-restitution and change of position); Samsoondar v Capital Insurance Co Ltd [2021] 2 All E.R. 1105 (pleading of unjust enrichment claims); Dargamo Holdings Ltd v Avonwick Holdings Ltd [2022] 1 All E.R. (Comm.) 1244 (failure of basis; relation between contract and unjust enrichment)