Fiona Jane Clubb, Durham University, Department of Geography, Durham, United Kingdom, Simon M Mudd, University of Edinburgh, School of GeoSciences, Edinburgh, United Kingdom, Stuart W D Grieve, Queen Mary, University of London, School of Geography, London, United Kingdom, Martin D Hurst, University of Glasgow, Glasgow, G12, United Kingdom, Boris Gailleton, University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom, David T Milodowski, University of Edinburgh, Edinburgh, EH9, United Kingdom, Declan Valters, British Geological Survey, Edinburgh, United Kingdom and Guillaume Goodwin, University of Edinburgh, School of Geosciences, Edinburgh, EH9, United Kingdom