1. Department of the Built Heritage, Faculty for the Built Environment, University of Malta, Msida MSD 2080, Malta
2. Transport Research Laboratory (TRL), 13 Swanston Steading, 109 Swanston Road, Edinburgh EH10 7DS, UK
3. Consultant, 40 Kingsdown Avenue, London W13 9PT, UK
4. School of Earth & Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth, Hampshire PO1 3QL, UK
5. British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottinghamshire NG12 5GG, UK
6. Formerly Kingston University, London, UK
7. Deptartment of Civil & Structural Engineering, Sheffield University, Kroto Research Institute, Broad Lane, Sheffield S3 7HQ, UK