In our research programme the overall goal is to explore how residual stress/strain influences the deformation and fracture behaviour of engineering steels at high temperatures. Towards this goal, a crystal-plasticity based computational model has been developed with potential to incorporate a significant number of grains. Room temperature in-situ neutron diffraction (ND) tests have been carried out at ISIS. The work to be undertaken in this proposal aims to quantify the in-situ lattice strain evolution during high temperature deformation of 316H stainless steel following prior inelastic compression for the purposes of calibrating our multi-scale model.