Holding in Company

Tullow Oil PLC
8 September 2000


Schedule 10 - Notification of Major Interests in Shares

1   Name of company:
Tullow Oil plc

2   Name of shareholder having a major interest:
Prudential plc

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:
Prudential plc

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

5   Number of shares/amount of stock acquired:
N/A

6   Percentage of issued class:
N/A

7   Number of shares/amount of stock disposed:
N/A

8   Percentage of issued class:
N/A

9   Class of security:
Tullow Oil plc IR£10p Ordinary Shares

10  Date of transaction:
N/A

11  Date company informed:
8th September 2000

12  Total holding following this notification:
48,462,699

13  Total percentage holding of issued class following this notification:
13.75%

14  Contact name for queries:
Tom Hickey

15 Contact telephone number:
+ 353 1 6218 5700

16  Name of company official responsible for making notification:
Tom Hickey

17  Date of notification:
8th September 2000


Additional Information: