Janet O'Sullivan is a Fellow and Director of Studies in Law at Selwyn College, Cambridge and a University Lecturer in the Faculty of Law, Cambridge University. She teaches and lectures in contract, tort, and restitution, has published widely in these fields, and is an Assistant Editor of Professional Negligence. She is a qualified solicitor and practised for some time in a major law firm. Jonathan Hilliard is a barrister at Wilberforce Chambers, London, specialising in commercial law, pensions and private client. He is the author of a number of articles and has supervised contract law at...