Modern vehicles are complex systems made of many different materials (metals, plastics, adhesives, foams and composites) and interconnecting components. The materials may interact with air, oil, moisture, and other environmental hazards during manufacture, shipping and storage as well as interaction with each other once they have been assembled in the vehicle and the vehicle enters into service. They may weaken, harden, corrode, or even fail. These physical and chemical changes in properties are often lumped together under the label "ageing." In the proposed research analytical material models will be studied and simulations will be performed for key structural and cosmetic materials used in JLR vehicles, with the aim to evaluate the change in their hygro-thermo-mechanical properties, distortion and surface finish between dissimilar materials and components, and their response to the in-service load case over the years in service.