The Department for Environment, Food and Rural Affairs (Defra) has published its response to the 2024 consultation on an alternative transitional registration model (ATRm) for UK REACH, confirming a streamlined approach to transitional registration for chemical substances in Great Britain. Defra decided to reduce the amount of information required upfront for substances already registered under EU REACH, on the basis that they are well understood, while retaining the 'no data, no market' principle, requiring hazard conclusions, maintaining proposals on chemical safety assessments, chemical safety reports and substance groups for data sharing, and introducing powers for regulators to request further information through transitional evaluations where necessary. The government also confirmed a policy of using decisions from trusted jurisdictions, particularly the EU, as the starting point for UK REACH decisions to improve efficiency, reduce trade friction and maintain protections. It decided not to introduce additional Great Britain-specific requirements on use and exposure, reflecting consultation feedback that these would impose disproportionate costs and practical burdens, particularly due to supply chain complexities and reliance on consultants, while responses more broadly supported reducing duplication in hazard data but raised concerns about data access, intellectual property and implementation. Wider reform proposals on restrictions, reporting and animal testing will be taken forward separately, with feedback indicating support for reducing administrative burdens and increasing use of alternatives to animal testing, alongside concerns about shortened consultation timelines and the need for clearer guidance.