Hydrophobins, hfb2, are secreted fungal proteins, which are strongly surface active and possess powerful emulsion and foam stabilising properties. Understanding their co-adsorption at the oil-water interface with other proteins and surfactants is key to their exploitation in emulsion based formulations. We have pioneered the use of SANS to investigate adsorption at the oil-water interface, and this has been recently applied to hfb2 / surfactant mixtures. Compared to other interfaces, some unexpected patterns of behaviour are observed at the oil-water interface, and we request beam time to explore this in more detail.