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ACKNOWLEDGEMENTS 
The authors wish to acknowledge NERC for a studentship 
awarded to R. Eyers (NER/S/A/2001/06525) and the supply of 
services and equipment from the ARSF (Awards 02/34 and 
03/09) and EPFS (414.1202). GIS data have kindly been 
supplied by the British Geological Survey, the Ordnance 
Survey and the Coal Authority. BAE Systems and Research 
Systems Inc. are acknowledged for their provision of software. 
Cambridge University Unit for Landscape Modelling provided 
photogrammetric scanning services.