The metal-organic framework (MOF) guanadinium copper formate is of interest in the quest towards rational design of multiferroic MOFs. It exhibits cooperative Jahn-Teller distortion of the Cu ions, meaning first that its space group is polar, potentially giving rise to ferroelectricity; second, the Cu-formate linkages are not isotropic, instead forming 1D antiferromagnetic spin-chains. Interactions within and between these chains have been characterised only by bulk susceptibility measurements, with results somewhat inconsistent with known behaviour of the spin-1/2 1D Heisenberg Hamiltonian. As part of an experimental programme also including magnetic neutron diffraction, we here propose a single-crystal inelastic neutron scattering measurement of the magnetic excitation dispersion curves at low T. This will enable accurate characterisation for the first time of the coupling constants.