**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 November 2004

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

Abbey National
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

CREDIT SUISSE FIRST BOSTON

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 them

CREDIT SUISSE FIRST BOSTON HOLDS THE FOLLOWING INTERESTS IN THE ISSUED SHARE CAPITAL :

> 1. CREDIT SUISSE FIRST BOSTON EQUITIES LIMITED 52,824,093 
>     2. CREDIT SUISSE FIRST BOSTON INTERNATIONAL LIMITED 1,403,360 
>     3. CREDIT SUISSE FIRST BOSTON (EUROPE) LIMITED 5,382,702

5. Number of shares / amount of stock acquired

562,733

6. Percentage of issued class

0.04%

7. Number of shares / amount of stock disposed

N/A

8. Percentage of issued class

N/A

9. Class of security

ORDINARY SHARES OF 10p EACH

10. Date of transaction

4th November 2004

11. Date company informed

8th November 2004

12. Total holding following this notification

59,610,155

13. Total percentage holding of issued class following this notification

4.01%

14. Any additional information



15. Name of contact and telephone number for queries

KAREN CARSON - 0207 756 4358

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

KAREN CARSON

Date of notification

10th NOVEMBER 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.
  END



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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:
      10th November 2004** |  | **By: /s/ Karen Carson**              
|                                   |  | **(Authorised Signatory)**************