Amphiphilic protein surfactant interactions are becoming increasingly important in all aspects of soft condensed matter for drug delivery, flavour enhancement, foam stability and emulsification and yet a full understanding the nature and mechanism of protein-surfactant interactions at the hydrophobic air water and oil water interfaces remains elusive. We have recently observed synergistic and competitive adsorption of the class 2 fungal protein Hydrophobin HFBII with Tween like ethoxylated surfactants at the air water interface, and are curious to see how this translates to a more realistic and relevant hydrophobic oil water interface. This is part of the basis of an industrial collaborative research agreement between Unilever R&D, ISIS and University of Oxford(PS-2011-1238), and is the focus of this proposal for SANS beam time on SANS2D using our established oil water emulsion route.