SANTANDER UK PLC

Prospectus • May 23, 2025

ARTICLE 17 NOTIFICATION

Santander UK plc (the "Issuer")

This notification refers to:

• (1) the Base Prospectus dated 14 March 2025, as supplemented from time to time (the Base Prospectus) for Notes to be issued by the Issuer under its Structured Note and Certificates Programme; and
• (2) the Final Terms dated 28 March 2025 (the Final Terms) in respect of the issue of up to £20,000,000 Preference Share-linked Autocallable Notes due May 2031 – Series 1283 (XS3029370791) (the Note Issue).

Pursuant to our obligations under Article 17 of the Prospectus Regulation (Regulation 2017/1129/EU, as amended and as incorporated into the law of the United Kingdom by the European Union (Withdrawal) Act 2018, as amended) we confirm in respect of the Note Issue the following information:

Final Aggregate Nominal Amount: £2,511,245

Paragraphs 4.1 and 4.2 of Part A to the Final Terms shall be read accordingly.

DISCLAIMER - INTENDED ADDRESSEES

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

Neither the Base Prospectus nor the Final Terms referenced herein constitute an offer of securities for sale 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, except pursuant to an exemption from the Securities Act.

END