Product lifetime represent an important area of enquiry with regards to product design, the circular economy[2] and sustainable development.[3] This is because products, with the materials involved in their design, production, distribution, use and disposal (across their life cycle), embody carbon due to the energy involved in these processes.[4] Therefore, if product lifetimes can be extended, the use of energy, embodied in carbon, can be reduced and progress can be made towards reducing greenhouse gas emissions.