I would like to thank those with whom I have worked both at the University of Bristol and at the University of East Anglia for their friend- ship, encouragement and advice in the years leading up to the publication of this book. Particular thanks are due to Caroline Ball, Dave Cowan, James Davey, Bronwen Morgan, Jill Morgan, Tony Prosser, Oliver Quick, Mike Radford, Claudina Richards and Mark Stallworthy.