Laser Shock Peening (LSP) is an advanced manufacturing process capable of introducing compressive residual stress within a component. Cracks in aeronautical structures can grow undetected between inspection periods. The move towards large, integral structures is making this issue more critical as these structures contain fewer natural crack-stopping features. LSP can address this issue by engineering unique residual-stress-guided crack propagation pathways. This effective combined stress state would then cause a deviation of the typical crack trajectory. Complex coupling of residual stresses and fracture mechanics is an extremely difficult problem to simulate. Hence we would like to investigate this interaction by neutron diffraction as it will allow for the characterisation of the stress field in a non-destructive fashion whilst allowing for full crack growth of the specimens.