34GO Sthn Gas 6.375%

SOUTHERN GAS NETWORKS PLC (the "Issuer")

(LEGAL IDENTIFIER NUMBER: 549300SPX8573VZ2SK79)

Notification of Investigation under s.25 of the Competition Act 1998

The Issuer has received notification from Gas and Electricity Markets Authority, the governing body of the Office of Gas and Electricity Markets, that it has opened an investigation under s.25 of the Competition Act 1998 into the conduct of Scotia Gas Networks Limited ("SGN") and any companies that form or previously formed part of the same corporate group which focusses on SGN's connections business. The Issuer is a wholly owned subsidiary of SGN.

The Issuer and SGN are cooperating fully with the investigation.

This announcement contains Inside Information for the purposes of Article 7 of the Market Abuse Regulation (EU) 596/2014 as it forms part of UK Domestic Law by virtue of the European Union (Withdrawal) Act 2018, as amended (the "UK Market Abuse Regulation").

For further information, please contact:

Alexander Rutherford

Treasurer

+44 (0)1293 818 316

treasury@sgn.co.uk

DISCLAIMER - INTENDED ADDRESSEES

This announcement is a communication to the market. Nothing in this announcement constitutes an offer of securities for sale in the United States or any other jurisdiction. This announcement does not constitute a prospectus or a prospectus equivalent document.

This announcement has been delivered to you on the basis that you are a person into whose possession this announcement may be lawfully delivered in accordance with the laws of the jurisdiction in which you are located and you may not, nor are you authorised to, deliver this announcement to any other person. The distribution of this announcement in jurisdictions other than the United Kingdom may be restricted by law and therefore persons into whose possession this announcement comes should inform themselves about, and observe, such restrictions. Any failure to comply with the restrictions may constitute a violation of the securities laws of any such jurisdiction.

Your right to access this service is conditional upon complying with the above requirement.