We aim to use total scattering and pair distribution function (PDF) analysis to determine the local structure of the disordered amide-borohydride, Na2BH4NH2. We wish to determine definitively the crystal structure of two polymorphs: a partially ordered orthorhombic phase and a disordered cubic phase. We will collect high quality diffraction data to utilise the diffuse scattering component for both polymorphs to reveal their local structure (via PDF analysis), as well as employing more rapid data collection for traditional analysis of Bragg reflections to study dynamically the phase transition between polymorphs. This knowledge will be used to infer the structural changes occurring immediately prior to hydrogen release from this material, identify possible local sites for dopants to improve its hydrogen storage properties and aid in the design of future hydrogen storage materials.