# 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 2004

ABBEY NATIONAL PLC(Translation of registrants
 name into English)

Abbey House, 2 Triton Square, Regents PlaceLondon
 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. . . .

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SCHEDULE 10


NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company



Abbey National plc



2. Name of shareholder having a major interest



Brandes Investment Partners LLC



3. Please state whether notification indicates that it is in respect of holding
  of the shareholder named in 2 above or in respect of a non-beneficial interest
  or in the case of an individual holder if it is a holding of that person's spouse
  or children under the age of 18



As 2 above



4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of
 the



Approximately 365 custodian banks unaffiliated with 2 above the names of which are not disclosed.



5. Number of shares / amount of stock acquired



Not disclosed



6. Percentage of issued class



Not disclosed





7. Number of shares / amount of stock disposed



Not disclosed



8. Percentage of issued class



Not disclosed



9. Class of security



Ordinary shares of 10 p each



10. Date of transaction



10 March 2004



11. Date company informed



25 March 2004



12. Total holding following this notification



48,714,831

Of the holding, 29,203,684 ordinary shares of 10p each are held in the form of 14,601,842 American Depositary
 Receipts (one American Depositary Receipt represents two ordinary shares of 10p each).



13. Total percentage holding of issued class following this notification



3.33%





14. Any additional information



15. Name of contact and telephone number for queries



Jason Wright 0207 756 4767



16. Name and signature of authorised company official responsible for making this notification



Jason Wright



Date of notification



26 March 2004



The FSA does not give any express or implied warranty as to the accuracy of this document or material
 and does not accept any liability for error or omission. The FSA is not liable for any damages (including,
 without limitation, damages for loss of business or loss of profits) arising in contract, tort or otherwise
 from the use of or inability to use this document, or any material contained in it, or from any action
 or decision taken as a result of using this document or any such material

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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.



|                    | ABBEY NATIONAL PLC                                
|------------------- | --------------------------------------------------
|Date: 26 March 2004 |                                                   
|                    | By:  /s/ Jason WrightJason WrightAbbey Secretariat