On 18 December 2018, the Department for Business, Energy & Industrial Strategy published an explanatory letter on the following Brexit related statutory instruments:

• The Electricity and Gas (Amendment etc) (EU Exit) Regulations 2019;
• The Gas (Security of Supply and Network Codes) (Amendment [Etc.] (EU Exit) Regulations 2019;
• The Electricity Network Codes and Guidelines (Markets and Trading) (Amendment) (EU Exit) Regulations 2019;
• The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019; and
• The Electricity and Gas (Market Integrity and Transparency) (Amendment) (EU Exit) Regulations 2019.