Offer period extension Series 1125-1126

OFFER PERIOD EXTENSION NOTIFICATION

relating to the offers by

Santander UK plc (the "Issuer")

of its

Series 1125 £20,000,000 Equity Index Linked Notes due 2024 (ISIN XS1739366992)

and

Series 1126 up to £10,000,000 Preference Share-linked Autocallable Notes due 2024 (ISIN XS1739372024)

This notification refers to:

(1) the Final Terms dated 1 February 2018 (the "Series 1125 Final Terms") relating to the issue of £20,000,000 Equity Index Linked Notes due 2024 - Series 1125 (ISIN XS1739366992) offered under the Issuer's Notes and Certificates Programme; and

(2) the Final Terms dated 26 February 2018 (the "Series 1126 Final Terms") relating to the issue of up to £10,000,000 Preference Share-linked Autocallable Notes due 2024 - Series 1126 (ISIN XS1739372024) offered under the Issuer's Structured Note and Certificate Programme.

The Issuer hereby announces that it shall extend the Offer Period for the Notes offered pursuant to the Series 1125 Final Terms and the Series 1126 Final Terms so that the Offer Period for each Series shall end at 5.00 p.m. (London time) on 8 May 2018.

Paragraph 7.4(c) of Part A to the Series 1125 Final Terms and the Series 1126 Final Terms and Section A.2 of the Summary of the Securities annexed thereto shall be read accordingly.

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the above mentioned Final Terms and related Base Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the relevant Final Terms and/or Base 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 relevant Final Terms and related Base Prospectus is not addressed. Prior to relying on the information contained in the relevant Base Prospectus and/or Final Terms, you must ascertain from the relevant Base Prospectus and/or 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 Base Prospectus nor Final Terms referred to herein constitutes 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

This announcement has been issued through the Companies Announcement Service of Euronext Dublin.