Hydrophobins are secreted fungal proteins and are small lipopeptide biosurfactants. They are strongly surface active and self-assemble at interfaces. Their unique film forming properties have stimulated applications where emulsion and foam stability is important. There is now a strong environmental drive for the development of more biocompatible / biosustainable surfactant based products, and Hydrophobin posseses many of the favourable qualities for inclusion in such formulations. However, little is known about their self-assembly properties at surfaces and in solution, and in particular about their interaction with conventional surfactants. We request here neutron reflectivity, NR, beam time on SURF to study the nature of the adsorption of Hydrophobin II and of Hydrophobin / surfactant mixtures at the air-solution interface.