Your health and safety responsibilities will not change when the UK leaves the EU. This guidance is under review.
In the enforcement section of the REACH website, you can find information on the UK enforcement regime for REACH, such as the roles and responsibilities of the REACH enforcing authorities, their enforcement powers, and the offences and penalties for contravention of the legislation. You can read about the arrangements that have been put into place for cooperation and information exchange between enforcing authorities in the UK and across the EU. You can also find out more about the enforcement work of the UK REACH Competent Authority (CA).