The NH4M(formate)3 (M = Mn, Fe, Co and Ni) series are the most promising members of a new family of multiferroics in which ferroelectric ordering is driven by hydrogen-bonding interactions between a magnetic framework and the guests contained in their pores. The ferroelectric transition and magnetic order of these materials vary significantly and neither the precise nature of the hydrogen bonding network nor the magnetic structures are known. A deeper understanding of how the magnetic structures and the hydrogen bonding network in the ferroelectric phases are modified by the different incorporated transition metals, will provide crucial insight into the development of new improved materials. These details can only be revealed through neutron diffraction and we will do so using WISH to take advantage of its ability to collect high-resolution data to large d-spacing.