Our objective is to determine structural models for some complex, mixed-metal oxide phases that are as complete as possible using analysis of PDFs produced from total neutron scattering. The materials we will study have been prepared by new synthetic methods, have important properties of potential relevance to technological applications but all suffer from some degree of intrinsic structural disorder that make the use of neutron scattering over a wide Q-range the ideal method for studying their structures. Our aim is to use the structural information combined with information from other methods and property measurements to not only understand the properties of the materials but also to rationalise the synthesis conditions used for their preparation in order to inform future synthesis of complex materials.