It's late, I think. This is from OUP's web site :

Title: Cases and Materials on the Law of Restitution
By Andrew Burrows and Ewan McKendrick.
900pp
Published 1997
Hardback, 0-19-876290-9
UK Price: £55.00

Restitution is one of the most hotly debated and topical areas of the common law. Written by two leading commentators on the subject, this book of cases and materials contains extracts from the leading cases, predominantly from the UK and the Commonwealth. There are also extracts from the writings of some of the world's leading academic authorities on restitution law. These materials are supported by comments and notes written by the editors and there are also questions and notes on further reading. Clearly, the components of this book form a thorough exploration of the law of restitution and as such will be essential reading for all students of the law in this area. The layout of the book offers students and teachers the chance to learn the subject through studying the cases and extracts from articles published in scholarly journals. This is supported by the authors' expert commentary and there are also quotations and notes on further reading.

Contents:

1 Unjust Enrichment
2 The Essential Ingredients of a Restitutionary Claim
3 Mistake
4 Ignorance
5 Failure of Consideration
6 Illegitimate Pressure
7 Undue Influence and Exploitation of Weakness
8 Legal Compulsion: Compulsory Discharge of Another's Debt
9 Necessity
10 Illegality as a Ground for Restitution
11 Incapacity as a Ground for Restitution
12 Ultra Vires Demands by Public Authorities
13 Restitution for Wrongs
14 Tracing and Proprietary Restitution
15 Defences

Paperback, 0-19-876291-7
UK Price: £27.50

Steve Hedley