This marine multibeam geophysical survey took place in August/September 2010 between Little Cumbrae Island and Hunterston on board the RV White Ribbon. The survey was carried out by the British Geological Survey (BGS) on behalf of Magnox North Ltd. Phase 1 (1-8 August 2010) collected Multibeam data and Phase 2 (7-8 September 2010) collected Surface Tow Boomer and Magnetometer data. Sea floor bathymetry data were collected using a Kongsberg EM3002D multibeam system. Sub bottom seismic data were collected using an Applied Acoustics Surface Tow Boomer (STB). Magnetometer data were collected using a SeaSpy Magnetics Magnetometer. These data are archived by BGS. Paper records were also generated for Boomer. Technical details of the survey are contained in Cruise report BGS CR/11/38. Geophysical dataset interpretation is contained in report BGS CR/10/142.