Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 (6-k)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934 For the month of April, 2023 Commission File Number 001-14928 SANTANDER UK PLC (Translation of registrant's name into English) 2 Triton Square, Regent's Place, London NW1 3AN, England (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F . . . .X. . . . Form 40-F . . . . . . . . THE REGISTRANT HEREBY INCORPORATES ALL PARTS OF THIS REPORT ON FORM 6-K BY REFERENCE INTO REGISTRATION STATEMENT NO. 333-265891 FILED BY THE REGISTRANT WITH THE SECURITIES AND EXCHANGE COMMISSION ON FORM F-3ASR UNDER THE SECURITIES ACT OF 1933.

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SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SANTANDER UK PLC Dated: 26 April 2023 By / s / Duke Dayal Duke Dayal Chief Financial Officer

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