Since the decision of the House of Lords in Woolwich Equitable Building Society v Inland Revenue Commissioners [1993] AC 70, the law governing claims for restitution of overpaid tax has experienced rapid and profound evolution. This has been so not only in England, but also elsewhere in the common law world as well as on the European plane. The essays in this collection consider the new landscape, and explore from various doctrinal and national perspectives the issues that have confronted, and continue to confront, the courts.

SECTION I. INTRODUCTION
1. Introduction
Steven Elliott, Birke Häcker and Charles Mitchell
SECTION II. ENGLISH LAW
2. Overpaid Taxes: A Hybrid Public and Private Approach
Rebecca Williams
3. Mistaken Payments of Tax
Duncan Sheehan
4. Restitution from Public Authorities: Any Room for Duress?
Nelson Enonchong
5. Reasons for Restitution
Charlie Webb
6. Restitutionary Claims by Indirect Taxpayers
Charles Mitchell
7. Property, Proportionality, and the Change of Position Defence
Niamh Cleary
8. Undoing Transactions for Tax Purposes: The Hastings-Bass Principle
Monica Bhandari
SECTION III. EUROPEAN LAW
9. Judicial Techniques in Relation to Remedies for Overpaid Tax
Catherine Barnard and Julian Ghosh KC
10. The Principle of Effectiveness and Restitution of Overpaid Tax
Maximilian Schlote
SECTION IV. COMPARATIVE LAW
11. Absence of Basis: A German Perspective
Anne Sanders
12. 'Public Law Restitutionary Claims': The German Perspective
Birke Häcker
13. Overpaid Taxes and Constitutional Redress in Ireland
Niamh Connolly
14. Restitution of Overpaid Tax in Canada
Robert Chambers
15. Restitution of Unlawfully Exacted Tax in Australia: The Woolwich Principle
Simone Degeling

Steven Elliott is a barrister at One Essex Court.
Birke Häcker is Professor of Comparative Law at the University of Oxford, Director of the Institute of European and Comparative Law, and a Professorial Fellow of Brasenose College, Oxford.
Charles Mitchell is a Professor of Law at University College London.