Wessex Water Services Finance Plc
17 December 2025

Wessex Water Services Finance Plc - LEI: 213800B9BFRCA1YMEI57

Wessex Water Services Limited - LEI: 213800RCUZO8NYF2KZ14

Publication of Admission Particulars

THIS ANNOUNCEMENT IS NOT FOR PUBLICATION, DISTRIBUTION OR RELEASE, DIRECTLY OR INDIRECTLY, IN THE UNITED STATES OR IN ANY OTHER JURISDICTION IN WHICH OFFERS OF SALES WOULD BE PROHIBITED BY APPLICABLE LAW

WESSEX WATER SERVICES FINANCE PLC

ANNUAL UPDATE OF EURO MEDIUM TERM NOTE PROGRAMME AND PUBLICATION OF ADMISSION PARTICULARS

Wessex Water Services Finance Plc, a wholly-owned finance subsidiary of Wessex Water Services Limited, today announces the annual renewal of its Euro Medium Term Note Programme (the "Programme").

As part of the annual update of the Programme, the following admission particulars (the "Admission Particulars") have been submitted and approved by the London Stock Exchange's International Securities Market:

Admission Particulars dated 16 December 2025 relating to the £5,000,000,000 Euro Medium Term Note Programme, published by Wessex Water Services Finance Plc, as Issuer, and unconditionally and irrevocably guaranteed by Wessex Water Services Limited, as Guarantor.

The full document can be viewed via the Wessex Water investor page https://corporate.wessexwater.co.uk/our-future/investors and for further information please email [email protected] .

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.

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

END.