In our research programme the overall goal is to explore and characterise the multiscale deformation in a high-strength ferritic power plant steel (P91/P92). A micromechanical model has been developed incorporating microstructural details and inelastic deformation mechanisms. The work to be undertaken in this proposal aims to examine to what extent in-situ neutron diffraction (ND) observations can correlate to the inelastic response of materials. It is expected to implement a strong link between measurements and simulations quantifying the dependence of lattice strain on the evolution of microplasticity.