FOSSE MASTER ISSUER PLC

(a public company incorporated with limited liability in England and Wales with registered number 05925693)

(the "Company")

Publication of Prospectus

24 June 2025

NOTICE IS HEREBY GIVEN that certain legal and regulatory updates and amendments have been made to the prospectus relating to the Residential Mortgage-Backed Note Programme of the Company (the "Prospectus"). The Prospectus is dated 24 June 2025 and has been approved by the Financial Conduct Authority and is available for viewing by clicking on or pasting the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/2576O_1-2025-6-24.pdf

A copy of the Prospectus listed above has also been submitted to the National Storage Mechanism and will shortly be available for inspection at: https://data.fca.org.uk/#/nsm/nationalstoragemechanism

The Prospectus will also be available for viewing at:

https://www.santander.co.uk/about-santander/investor-relations/fosse-master-trust

For further information, please contact:

Funding, Asset Rotation and Investor Relations
Santander UK plc

2 Triton Square

Regent's Place

London

NW1 3AN

Email: [email protected]

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) 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 Prospectus is not addressed. Prior to relying on the information contained in the Prospectus, you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein.

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

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 in, the United States of America, or to, or for the benefit of, U.S. persons (as defined in Regulation S of the Securities Act) except to persons that are qualified institutional buyers within the meaning of Rule 144A under the Securities Act, or in transactions that occur outside the United States to persons other than U.S. persons in accordance with Regulation S, unless the securities are registered under the Securities Act or an exemption from the registration requirements of the Securities Act is available.