I would like to thank the support of a number of people who have contributed to this dissertation. A general vote of thanks must be offered to all the staff and students at both Cardiff and Sheffield, in particular John Barrett, Douglas Bailey, Vicki Cummings, Robin Dennell, Mark Edmonds, Glynis Jones, Samantha Lewis, John Moreland, Mike Parker Pearson, Bronwen Price, Howard Williams and Alasdair Whittle have donated time and effort above and beyond the call of duty. My parents have provided much-needed moral, intellectual and financial support. My sister and friends have been essential in keeping me from taking anything I wrote, or indeed myself, too seriously. Finally I would like to dedicate this work to Hilda Davies whose capacity for kindness was matched only by her thirst for knowledge. This is for her.