Holding(s) in Company

Tullow Oil PLC
02 August 2004

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

Tullow Oil plc

2. Name of shareholder having a major interest

Fidelity International Limited (FIL) and its direct and indirect subsidiaries.

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

Notification relates to above-named shareholders' non-beneficial interests held
through direct and indirect subsidiaries including: Fidelity Investment Services
Ltd (FISL) and Fidelity Pension Management (FPM). The notifiable interests also
comprise the notifiable interest of Edward C. Johnson 3d, a principal
shareholder of Fidelity International Limited

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

7,456,765     FISL     Chase Nominees Ltd

  537,400     FISL     Chase Manhattan Bank London

  343,947     FPM      Citibank

  175,948     FPM      HSBC

  267,794     FPM      Bank of New York London

2,376,979     FIL      MSS Nominees Ltd
  
  737,450     FIL      Bank of New York - Brussels

  518,471     FIL      Chase Nominees Ltd

  168,104     FIL      Bankers Trust

  377,930     FIL      Bank of Ireland

  437,447     FIL      Chase Manhattan Bank London

  449,538     FIL      Northern Trust

  189,511     FIL      State Street Bank & Trust

1,008,534     FIL      Bank of New York London

1,176,083     FIL      Nortrust Nominees Ltd

  47,100      FIL      Mellon Nominees Ltd

 831,936      FIL      JP Morgan

 483,779      FIL      State Street Nominees Ltd

 575,149      FIL      Morgan Stanley

 233,818      FIL      Deutsche Bank

5. Number of shares / amount of stock acquired



6. Percentage of issued class



7. Number of shares / amount of stock disposed

6,251,509 since last notification

8. Percentage of issued class

0.97%

9. Class of security

Ordinary 10p shares

10. Date of transaction


11. Date company informed

30 July 2004

12. Total holding following this notification

18,394,143

13. Total percentage holding of issued class following this notification

2.87%

14. Any additional information

Total shares in issue 641,720,002

15. Name of contact and telephone number for queries

Tom Hickey 0207 333 6800

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

Tom Hickey

Date of notification

2 August 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.


                      This information is provided by RNS
            The company news service from the London Stock Exchange