Holding(s) in Company

Tullow Oil PLC
22 October 2004

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company

Tullow Oil plc

2. Name of shareholder having a major interest

Merrill Lynch Investment Managers Group Limited

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

See 4 Below

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

Registered Holder / Number of shares / Beneficial Interest (Yes/No)

Nutraco Nominees Limited / 33,950,674 / No

Merrill Lynch Pension Nominees Ltd / 4,541,640 / Yes
A/C Noncert

Treasury of the Government of / 1,351,397 / No
Isle of Man A/C5

Treasury of the Government of / 629,946 / No
Isle of Man A/C 10

Morgan Nominees Limited / 1,870,186 / No

Bank of New York Nominees Limited / 1,007,809 / No

Nortrust Nominees Limited / 3,064,000 / No

Chase Nominees Limited / 4,740,000 / No

Other names / 12,993,226 / No

5. Number of shares / amount of stock acquired




6. Percentage of issued class




7. Number of shares / amount of stock disposed




8. Percentage of issued class




9. Class of security

Ordinary 10p shares

10. Date of transaction




11. Date company informed

22 October 2004

12. Total holding following this notification

64,148,878

13. Total percentage holding of issued class following this notification

9.96%   (Total shares in issue 643,702,862)

14. Any additional information

The Company has been advised that, for the purposes of provisions of sections 
198-202 (as amended) of the Companies Act 1985, neither Merrill Lynch Investment 
Managers Group Limited nor any of its subsidiaries has a notifiable interest in
the relevant share capital as of 20 October 2004.

15. Name of contact and telephone number for queries

Aidan Heavey  0207 333 6800

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

Aidan Heavey

Date of notification

22 October 2004

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for loss of business or loss of profits) arising in contract, tort or otherwise
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it, or from any action or decision taken as a result of using this document or
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