FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer

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

Securities Exchange Act of 1934

For the month of March 2007

ABBEY NATIONAL PLC

(Translation of registrant's name into English)

Abbey National House, 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 . . . .X. . . . 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 . . .X. . . .

Abbey National plc - Preliminary Results Announcement

Year Ended 31 December 2006

On 1 February 2007, Abbey National plc ('Abbey') issued a Trading Statement summarising the results for the year ended 31 December 2006. That statement was unaudited and did not comprise a results announcement. It contained narrative on business trends and new business.

This preliminary results announcement is a follow-up to the Trading Statement and comprises Abbey's 2006 full year results announcement. It contains audited primary financial statements, consisting of a statutory income statement, balance sheet, statement of recognised income and expense, and cash flow statement. For further details of business trends it should be read in conjunction with the Trading Statement issued on 1 February 2007.

Whilst the financial information included in this preliminary results announcement has been calculated in accordance with International Financial Reporting Standards (IFRS), this preliminary results announcement does not contain all the financial statement disclosures that would be required under IFRS. Abbey's Annual Report and Accounts, including full financial statements that comply with IFRS have also been published today.

Group Summary

Summarised consolidated statutory income statement and selected ratios

2006 compared to 2005

Profit on continuing operations before tax of £428m increased from £362m in 2005. Material movements by line include:

•  Net interest income of £1,228m compared to £1,172m in 2005 increased by £56m. The increase relates in part to earnings on the proceeds from the sale of the life businesses in 2006. The remaining movement was largely due to higher Retail Banking income driven by growth in retail lending assets and stable retail spreads being offset by the reduction in income from asset financing operations and other businesses, which are being run-down.
• Non-interest income of £1,242m compared to £1,183m in 2005 increased by £59m. The increase relates primarily to the uplift in revenues within Financial Markets due to the benefits of favourable market conditions and increased external business.
• Administrative expenses of £1,420m (2005: £1,577m) decreased by £157m. The reduction largely reflects the benefits of the cost reduction programme with the majority of the savings relating to employment costs driven by a headcount reduction of approximately 2,000 in 2006 (excluding the reduction reflecting the impact of the sale of the life insurance businesses). In addition, the 2005 administrative expenses included misselling administration costs of £70m.
• Depreciation and amortisation of £215m compared to £195m in 2005 increased by £20m due to the timing of asset additions in 2005.
• Impairment losses on loans and advances of £344m compared to £218m in 2005 increased by £126m. The growth was partly driven by strengthening of the coverage ratio and in part by the maturing nature of the unsecured personal loan portfolio, including portfolios that are no longer open to new business, with some deterioration in quality. The remaining increase was mainly due to mortgage-related charges increasing modestly from a very low base relative to the overall book.
• Provisions for other liabilities and charges of £63m compared to £3m in 2005 increased by £60m due to provisions for misselling remediation payments to customers.

(Loss) / profit for the year from discontinued operations of £(245)m (2005: £166m) comprises the profit of the discontinued operations of £19m (2005: £166m) and a loss on sale of £264m. The decrease in profit reflects the sale of the life insurance business in the third quarter of 2006, together with an increased level of lapses on with-profits bonds in 2006 prior to the sale, and an impairment charge of £69m on intangible assets. The loss on sale principally reflects the discount to embedded value that is normal in sales of life insurance businesses.

Consolidated Income Statement

For the years ended 31 December 2006 and 2005

Consolidated Balance Sheet

As at 31 December 2006 and 2005

Consolidated Statement of Recognised Income and Expense

For the years ended 31 December 2006 and 2005

Consolidated Cash Flow Statement

For the years ended 31 December 2006 and 2005

Abbey & Santander

Abbey National plc ('Abbey') is a wholly owned subsidiary of Banco Santander Central Hispano, S.A. ('Santander') (SAN.MC, STD.N). Founded in 1857, Santander has more than 60 million customers, over 10,000 offices and a presence in over 40 countries. It is the largest financial group in Spain and is a major player in Latin America and elsewhere in Europe, including in the United Kingdom (through Abbey) and in Portugal. Through Santander Consumer it also operates a leading consumer finance franchise in Germany, Italy, Spain and ten other European countries.

Santander has a secondary listing of its ordinary shares on the London Stock Exchange and Abbey continues to have its preference shares listed on the London Stock Exchange. Nothing in this preliminary results announcement constitutes or should be construed as constituting a profit forecast.

Disclaimer

Abbey and Santander both caution that this preliminary results announcement may contain forward-looking statements. The US Private Securities Litigation Reform Act of 1995 contains a safe harbour for forward-looking statements on which we rely in making such statements in documents filed with the US Securities and Exchange Commission. Such forward looking statements are found in various places throughout this preliminary results announcement. Words such as 'believes', 'anticipates', 'expects', 'intends', 'aims' and 'plans' and 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 Abbey and 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. These factors include, but are not limited to, (1) inflation, interest rate, exchange rate, market and monetary fluctuations; (2) the effect of, and changes to, regulation and government policy; (3) the effects of competition in the geographic and business areas in which we conduct operations; (4) technological changes; and (5) our success at managing the risks of the foregoing. The foregoing list of important factors is not exhaustive. When relying on forward-looking statements to make decisions with respect to Abbey or Santander, investors and others should carefully consider the foregoing factors and other uncertainties and events. 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 (including earnings per share) for any period will necessarily match or exceed those of any prior year.

The financial information set out in this preliminary results announcement does not constitute Abbey's statutory accounts for the years ended 31 December 2006 or 2005, but is derived from those accounts. Statutory accounts for 2005 have been delivered to the Registrar of Companies and those for 2006 will be delivered in due course. The auditors have reported on those accounts; their reports were unqualified and did not contain statements under sections 237(2) or (3) Companies Act 1985.

Contacts

Matthew Young (Communications Director) 020 7756 4232

Anthony Frost (Head of Media Relations) 020 7756 5536

Bruce Rush (Investor Relations) 020 7756 4275

Simon Donovan (Investor Relations) 020 7756 4476

For more information contact: ir@abbey.com

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.