This Practice Note gives an overview of the ‘safety case regime’, a set of regulations applicable to owners and operators of offshore oil and gas installations, aimed at reducing the risks from major accident hazards to the health and safety of the workforce employed on offshore installations, and in connected activities. Brexit impact 11 pm (GMT) on 31 December 2020 marked the end of the Brexit transition/implementation period entered into following the UK’s withdrawal from the EU. At this point in time (referred to in UK law as ‘IP completion day’), key transitional arrangements came to an end and significant changes began to take effect across the UK’s legal regime. This document contains guidance on subjects impacted by these changes. Upon IP completion day, the European Union (Withdrawal) Act 2018 (EU(W)A 2018) created a new category of domestic UK law—retained EU Law (REUL)—made up of EU-derived rights and legislation that were preserved in the UK following Brexit. On 29 June 2023, the Retained EU Law (Revocation and Reform)