We wish to use powder neutron diffraction to investigate sulphide thermoelectrics, designed as low-cost materials for low-grade waste heat recovery. The materials couple low-dimensional building units with the capacity to tune the Fermi level by chemical manipulation. This strategy has led to materials with ZT as high as 0.3 at 100C. We will exploit the contrast between elements of similar atomic number afforded by neutron techniques to determine cation distributions in CoxTiS2 (x<0.5) and CuCr1-xVxS2 (x<0.2), establish vacancy ordering schemes as a function of cobalt content in CoxTiS2 and distinguish between substitution and intercalation in MoxTi1-xS2. Low-temperature measurements will be used to investigate magnetically ordered states in CoxTiS2, whilst we will investigate the origin of the reported performance (ZT=2 @ 300K) of CuCrS2 by in-situ measurements at high temperature.