Wessex Water Services Finance Plc - LEI: 213800B9BFRCA1YMEI57

Wessex Water Services Limited - LEI: 213800RCUZO8NYF2KZ14

EMTN Programme - Publication of supplementary admission particulars

WESSEX WATER SERVICES FINANCE PLC

The following supplementary admission particulars are available for viewing:

Supplementary admission particulars dated 21 July 2026 (the "Supplement") supplementing the base admission particulars dated 16 December 2025 (together with the Supplement, the "Admission Particulars") relating to the £5,000,000,000 Euro Medium Term Note Programme established by Wessex Water Services Finance Plc, and unconditionally and irrevocably guaranteed by Wessex Water Services Limited.

To view the Supplement, please paste the following URL into the address bar of your browser:

https://corporate.wessexwater.co.uk/our-future/investors/debt-issuance-and-emtn-programme

For further information, please contact Chris Chambers, Group Treasurer, on +44 (0) 7901 517030.

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Admission Particulars may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Admission Particulars) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Admission Particulars is not addressed.  Prior to relying on the information contained in the Admission Particulars you must ascertain from the Admission Particulars whether or not you are part of the intended addressees of the information contained therein.

In particular, the Admission Particulars do not constitute an offer of securities for sale in the United States. This is not for distribution in the United States. The securities described herein have not been, and will not be, registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), or under any relevant securities laws of any state of the United States of America and may not be offered or sold to U.S. persons or to persons within the United States of America (as such terms are defined in Regulation S under the Securities Act), except pursuant to an exemption from the Securities Act. For a further description of certain restrictions on offers and sales of the notes and on distribution of the Admission Particulars, see the "Subscription and Sale" section of the Admission Particulars.

This announcement does not constitute or form part of an offer to sell or the solicitation of an offer to subscribe for or otherwise acquire any securities.

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