Polystyrene latex represents an excellent model system for studies of the physical properties of colloidal particles. The materials can be prepared with controlled size, and under suitable conditions, the particles from extended 'lattices' in the bulk phase. At interfaces, the bulk structure is changes considerably, and there is currently great interest in the relationship between bulk and interfacial structure under various conditions.For typical sized particles (~90 nm), the bulk unit cell is too large to be easily studied by SANS. Similarly, at the interface, the lateral organisation is too small to be studied by reflectivity. Neutron Spin Echo circumvents both these problems, and so OffSpec uniquely allows the bulk structure to be stusied using SESANS, and the interfacial structure to be resolved using spin echo reflectivity on the same sample.