ACKNOWLEDGEMENTS
The publishers acknowledge with gratitude the financial support received for this project from the Dr Mortimer and Theresa Sackler Foundation and the World Monuments Fund.
We would also like to acknowledge the support received from Canterbury Cathedral and the Canterbury Cathedral Trust and thank our consultants: Leonie Seliger, Director of Stained Glass at Canterbury Cathedral, and Bob Newport, Professor of Materials Physics at the University of Kent, Canterbury, for their invaluable assistance.