Metal-doped TiO2 have particular applications as in catalysis of a range of reactions as well as in luminescence materials. Our strategy is to make well-defined molecular TixOy complexes which have one or more other transition, lanthanide or main group metal centres present. One interesting scientific issue is in obtaining very large TixOy molecules containing dopant metals which may function as photo-induced reduction/oxidation ¿engines¿ for a range of organic reactions. Our recently synthesised Ti28La cage is the largest complete TixOy cage to be observed so far, as such its complete characterization is important from a purist standpoint alone. The particular reason why we have approached ISIS is that there is an unexpected feature of the structure of this cage which we are unable to elucidate without neutron diffraction. Therefore, we ask for 10 days on SXD.