1. Department of Geography, Royal Holloway University of London Egham Surrey TW20 0EX UK
2. British Geological Survey Keyworth Nottingham NG12 5GG UK
3. School of Environmental Sciences University of East Anglia Norwich NR4 7TJ UK
4. Royal Holloway University of London School of the Biological Sciences Egham Surrey TW20 0EX UK
5. Department of Earth Sciences, Royal Holloway University of London Egham Surrey TW20 0EX UK
6. Bullimores Sand and Gravel Ltd South Witham Lincolnshire NG33 5QE UK