Blocklisting Return

1.

Name of applicant: Tullow Oil plc

2.

Name of scheme: Tullow Oil 1998 Executive Share Option Scheme ('1998 Scheme"), and Tullow Oil 2000 Executive Share Option Scheme ("2000 Scheme")

3.

Period of return: From: 5 May 2008 to: 4 November 2008

4.

Balance of unallotted securities under scheme(s) from previous return: 

3,156,406 ordinary shares of 10p split 1,459,691 - 1998 Scheme 1,696,715 - 2000 Scheme

5.

Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):

1,925,633 - 1998 Scheme 5,000,000 - 2000 Scheme

6.

Less: Number of securities issued/allotted under scheme(s) during period:

2,785,307 - 1998 Scheme 2,218,656 - 2000 Scheme

7.

Equals: Balance under scheme(s) not yet issued/allotted at end of period:

5,078,076 ordinary shares of 10p split: 1,166,668 - 1998 Scheme 3,911,408 - 2000 Scheme

Name of contact:  Richard Taylor, Tullow Oil plc

Telephone number of contact:  +44 208 996 1000