First and foremost, my thanks go to the participants of this research. I cannot thank them individually of course as I promised them anonymity, but I am grateful for their generous help and support for this research and for sharing their stories and experiences with me. I am indebted to many people for their encouragement and guidance as this project developed. It has been a long time in the writing! The book is based on doctoral research in the Department of Criminology and Sociology at the University of Hull, and particular thanks go to my supervisors Mike McCahill and Simon Green, for their initial reassurance to embark upon doctoral studies, their constructive feedback on numerous drafts of my thesis and their inspiration and support to develop the thesis into a book. Chris Greer and Keith Tester examined my PhD thesis and their perceptive comments proved extremely useful when the time (eventually!) came to write this book. My thanks also go to my colleagues at Hull and elsewhere, with whom I discussed my research as it has developed over the years.