As the operator of a facility in the UK do existing Best Available Technique guidelines continue to apply? Larger industrial facilities undertaking specific types of activity are required to use Best Available Techniques (BAT) to reduce emissions to air, water and land. BAT means the available techniques which are the best for preventing or minimising emissions and impacts on the environment. ‘Techniques’ include both the technology used and the way an installation is designed, built, maintained, operated and decommissioned. Following Brexit, the Industrial Emissions Directive, Directive 2010/75/EU (IED) and BAT Conclusion Implementing Decision, (Commission Implementing Decision (EU) 2018/1147), are not within the scope of retained EU law. Instead, it is the EU-derived domestic legislation implementing the directives that is retained. The IED aims to prevent and reduce harmful industrial emissions, while promoting the use of techniques that reduce pollutant emissions and that are energy and resource efficient. Larger industrial facilities undertaking specific types of activity are required to use BAT to reduce emissions