An EPSRC funded project has commenced in order to study the residual stress distribution of hot rolled Ti-6Al-4V alloy plate and the evolution of such stresses induced by heat treatments over a large elevated temperature range. This project involves both the measurement of residual stress and development of a computational model for the prediction of microstructure and residual stress evolution due to heat treatment. Two plate thicknesses subjected to three heat treatment conditions have undergone initial residual stress measurement by means of X-ray diffraction (XRD) and the contour method, allowing for surface and through-thickness evaluation of residual stresses. Residual stress measurement by neutron diffraction using ENGIN-X will be conducted to provide contour method measurement validation and model verification; further developing our understanding of residual stress evolution.