We have also considered options for mandatory PFAS reporting through the Defra-commissioned research referenced in our response to recommendation 11. This work found that obtaining information on what PFAS is contained in mixtures and articles, and their concentrations, would be challenging in many cases. Given that chemical supply chains are often global, spanning multiple jurisdictions, this adds significant complexity to tracing PFAS use, as information may be fragmented, inconsistently recorded, or not readily accessible. As a result, mandatory reporting requirements would require careful design to ensure they are practical, proportionate and capable of delivering meaningful improvements in transparency. Through delivery of the PFAS Plan, we will continue to engage with industry to explore how supply chain transparency can be improved over time.