Most of the chapters here first appeared as papers at the Bentham House Symposium held at UCL in May 2015. This was an exciting and stimulating conference, bringing together academics from different disciplines and practitioners, for challenging and thought- provoking debate. The papers benefited greatly from the discussion and I would like to thank the CIOT for its funding of the conference and also the law faculty at UCL for hosting the conference and the support through the Bentham House Conference funding (particularly Charles Mitchell and James Penner for their support of this project and Lisa Penfold for helping the symposium to run so smoothly). Thanks also to my research assistant James Webb for his assistance with the conference and in the editing of this book, as well as Maxwell Myers for his help with ensuring the chapters met with house style. Of course thanks also to the contributors for bearing with us and our demands, and for being patient with the publication of this collection, as well as OUP for their help and support in bringing this collection to life.