Noel Gourmelen, University of Edinburgh, School of Geosciences, Edinburgh, EH9, United Kingdom, Livia Jakob, Earthwave Ltd, Edinburgh, United Kingdom, Paul Holland, British Antarctic Survey, Cambridge, United Kingdom, Pierre Dutrieux, NERC British Antarctic Survey, Cambridge, United Kingdom, Daniel Goldberg, School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom, Adrian J Luckman, Swansea University, Glaciology Group, Swansea, United Kingdom, George Malczyk, University of Edinburgh, Edinburgh, United Kingdom and Suzanne Bevan, Swansea University, Swansea, United Kingdom