# 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 September 2004

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. . . .

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|SCHEDULE 5
|----------





|SCHEDULE 5BLOCKLISTING SIX MONTHLY RETURN
|-----------------------------------------



|    |                      |                             
|--- | -------------------- | ----------------------------
|To: |                      | Listing Applications        
|    | UK Listing Authority
|    |                      | Financial Services Authority
|    |                      | 25, The North Colonnade     
|    |                      | Canary Wharf                
|    | London, E14 5HS     





|Please ensure the entries on this return are typed
|--------------------------------------------------



|                                                                                                             |  | 
|------------------------------------------------------------------------------------------------------------ |  | 
|1. Name of Company                                                                                          
|Abbey National PLC                                                                                          
|2. Name of scheme                                                                                           
|Abbey National Employee Share Option Scheme                                                                 
|3. Period of return:                                                                                        
|From         01/03/2004                                        To           31/08/2004                      
|4. Number and class of shares(s) (amount of stock / debt security) not issued under scheme                  
|1,584,743                                                                                                   
|5. Number of shares issued / allotted under scheme during period:                                           
|0                                                                                                           
|6. Balance under scheme not yet issued / allotted at end of period                                          
|1,584,743                                                                                                   
|7. Number and class of share(s) (amount of stock / debt securities) originally listed and the date of       
|admission;                                                                                                  
|784,313 ordinary 10p shares 08/11/1996                                                                      
|1,149,420 ordinary 10p shares 20/09/2000                                                                    
|1,500,000 ordinary 10p shares 24/12/2001                                                                    
|Please confirm total number of shares in issue at the end of the period in order for us to update ourrecords
|3,433,733                                                                                                   
|Contact for queries                                                                                         
|Name Karen Carson                                                                                           

---

|SCHEDULE 5
|----------



|                        |  |                                                 
|----------------------- |  | ------------------------------------------------
|Address                 |  | 2 Triton Square, Regent's Place, London, NW1 3AN
|Telephone               |  | 0207 756 4358                                   
|Person makingthe return
|Name                    |  | Karen Carson                                    
|Position                |  | Secretariat Assistant                           
|Signature               |  |                                                 

Page 2 of 2

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.



---

# 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: 1 September 2004 |  | By: /s/Karen Carson              
|                       |  | Karen Carson**Abbey Secretariat**