SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16

of Securities Exchange Act of 1934

For the month of October 2017

SANTANDER UK PLC

(Translation of registrant’s name into English)

2 Triton Square, Regent’s

Place, London NW1 3AN, England

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ☐            No  ☒

The registrant hereby incorporates all parts of this Report on Form 6-K by reference into Registration Statement No. 333-213861 filed by the registrant with the Securities and Exchange Commission on Form F-3ASR under the Securities Act of 1933.

This Report on Form 6-K contains references to websites of the registrant and its affiliates. The registrant is not incorporating by reference any information posted on such websites.

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 October 2017	By	/s/ Marc Boston
	(Authorised Signatory)

Supplementary consolidated information for Santander UK plc and its controlled entities

Santander UK plc is the principal subsidiary of Santander UK Group Holdings plc. The summarised consolidated income statement, summary of segmental balance sheet assets and liabilities and summarised consolidated capital for Santander UK plc and its controlled entities are shown below.

The information in this Appendix is unaudited and does not constitute statutory accounts within the meaning of section 434 of the Companies Act 2006 or interim financial statements in accordance with International Accounting Standard 34 ‘Interim Financial Reporting’. The information in this Appendix has been prepared in accordance with Santander UK plc’s accounting policies described in its Annual Report on Form 20-F for the year ended 31 December 2016 filed with the U.S. Securities and Exchange Commission (SEC) on 1 March 2017, except for the presentation of fair value changes relating to own credit on liabilities designated at fair value through profit or loss. ¹

Summarised consolidated income statement	9M17 £m			9M16 £m
Net interest income		2,878			2,656
Non-interest income 2		859			935
Total operating income		3,737			3,591
Operating expenses before impairment losses, provisions and charges		(1,825	)		(1,790	)
Impairment losses on loans and advances		(105	)		(103	)
Provisions for other liabilities and charges		(237	)		(141	)
Total operating impairment losses, provisions and charges		(342	)		(244	)
Profit before tax		1,570			1,557
Tax on profit		(477	)		(460	)
Profit after tax for the period		1,093			1,097
Summary of segmental balance sheet assets and liabilities	30.09.17 £bn			31.12.16 £bn
Customer loans
Retail Banking		167.9			168.6
Commercial Banking		19.5			19.4
Global Corporate Banking		6.6			5.7
Corporate Centre		6.0			6.5
Total customer loans		200.0			200.2
Other assets		114.8			102.9
Total assets		314.8			303.1
Customer deposits
Retail Banking		148.9			148.1
Commercial Banking		18.6			17.2
Global Corporate Banking		4.2			4.1
Corporate Centre		3.3			3.0
Total customer deposits		175.0			172.4
Medium Term Funding 3		40.1			46.1
Other liabilities		82.5			68.5
Total liabilities		297.6			287.0
Shareholders’ equity 1		17.0			15.9
Non-controlling interests		0.2			0.2
Total liabilities and equity		314.8			303.1
Summarised consolidated capital	30.09.17 £bn			31.12.16 £bn
Capital – CRD IV
Total qualifying regulatory capital		17.2			16.2
Risk-weighted assets (RWAs)		88.1			87.6
Total capital ratio		19.5	%		18.5	%

1. We have elected to early apply the IFRS 9 requirement for the presentation of gains and losses on financial liabilities relating to own credit in other comprehensive income from 1 January 2017. The cumulative own credit adjustment component of the cumulative fair value adjustment on financial liabilities designated at fair value through profit or loss has been included in opening retained earnings. Comparatives have not been restated. We have not adopted the other requirements in IFRS 9.

2. Comprised of ‘Net fee and commission income’ and ‘Net trading and other income’.

3. Medium Term Funding includes downstreamed funding, in the form of loans that rank pari passu with existing senior unsecured liabilities, from Santander UK Group Holdings plc.

Disclaimer

Santander UK plc (Santander UK) and Banco Santander both caution that this announcement may contain forward-looking statements. Such forward-looking statements are found in various places throughout this announcement. Words such as “believes”, “anticipates”, “expects”, “intends”, “aims” and “plans” and other similar expressions are intended to identify forward-looking statements, but they are not the exclusive means of identifying such statements. Forward-looking statements include, without limitation, statements concerning our future business development and economic performance. These forward-looking statements are based on management’s current expectations, estimates and projections and both Santander UK and Banco Santander caution that these statements are not guarantees of future performance. We also caution readers that a number of important factors could cause actual results to differ materially from the plans, objectives, expectations, estimates and intentions expressed in such forward-looking statements. We have identified certain of these factors in the forward looking statements on page 272 of the Santander UK plc 2016 Annual Report on Form 20-F filed with the SEC on 1 March 2017 and page 51 of the Santander UK plc Half Yearly Financial Report on Form 6-K for the six months ended 30 June 2017 filed with the SEC on 18 September 2017. Investors and others should carefully consider the foregoing factors and other uncertainties and events. Undue reliance should not be placed on forward-looking statements when making decisions with respect to Santander UK, Santander UK Group Holdings plc, Banco Santander and/or their securities. Such forward-looking statements speak only as of the date on which they are made, and we do not undertake any obligation to update or revise any of them, whether as a result of new information, future events or otherwise. Statements as to historical performance, historical share price or financial accretion are not intended to mean that future performance, future share price or future earnings for any period will necessarily match or exceed those of any prior quarter. Nothing in this Quarterly Management Statement should be construed as profit forecast.

Santander UK is a frequent issuer in the debt capital markets and regularly meets with investors via formal roadshows and other ad hoc meetings. In line with Santander UK’s usual practice, over the coming quarter it expects to meet with investors globally to discuss this Quarterly Management Statement, the results contained herein and other matters relating to Santander UK.