Calculations for SPLEED from the nickel (110) surface, with an angle of incidence of 45 degrees , are compared with experiment in the energy range 5-30 eV: strong azimuthal dependence in the exchange asymmetry is predicted. An optimisation of the geometrical, vibrational, and magnetic parameters, both surface and bulk, is presented. The comparison gives insight into the factors affecting spin-polarised electron scattering from ferromagnetic surfaces, but shows that there is no simple, unambiguous relation between spin asymmetry and surface magnetism.