Methane clathrates are likely to be an important constituent of icy satellite interiors and a source of methane in the atmosphere of Saturn's giant satellite Titan. There is uncertainty concerning the phase behaviour of this material under the conditions in Titan's interior, particularly close to the dissociation curve. At room temperature, the primitive cubic low-pressure phase transforms to a hexagonal structure at ~ 0.9 GPa, and then to an orthorhombic phase at ~ 2 GPa. However, there is evidence that this sequence is interrupted by the occurrence of a fcc phase prior to the hexagonal phase at temperatures close to the dissociation curve. Our objective is to compress methane clathrate near to the dissociation curve in order to establish the definitive sequence of phase changes, and to obtain P-V data on those phases for comparison with our earlier study.