CuH was first prepared by Wurtz in 1844 by the reaction of aqueous copper sulfate with hypophosphorous acid. Several other routes have been developed including precipitation of the hydride from pyridine solutions of CuI and LiAlH4 and reduction of aqueous Cu2+ by borohydride ion. The products always include a significant quantity of either water or pyridine. Our previous proposals (RB1110114 on TOSCA and RB1100007 on SANDALS) set out to answer two questions: firstly is the CuH produced from all three routes the same and secondly what is the interaction between the water or pyridine and the surface? Our combined spectroscopy and diffraction approach has shown that all three routes result in the same product. The nature of the interaction between pyridine and the CuH core has been difficult to examine; the aim of this proposal is to characterise the interaction to complete the project.