Blocklisting Interim Review

Tullow Oil PLC
08 May 2008

                        BLOCKLISTING SIX MONTHLY RETURN



Information provided on this form must be typed or printed electronically.



To:  The FSA

     The Irish Stock Exchange



Date: 8 May 2008



1. Name of applicant:



   Tullow Oil plc


2. Name of schemes



   Tullow Oil 1998 Executive Share Option Scheme ('1998 Scheme')
   Tullow Oil 2000 Executive Share Option Scheme ('2000 Scheme')



3. Period of return:


From:     5 November 2007                            To:    4 May 2008



4. Balance under scheme from previous return:


   3,508,780 ordinary shares of 10p each split



 1,459,691 - 1998 Scheme

 2,049,089 - 2000 Scheme


5. The amount by which the block scheme has been increased, if the scheme 
has been increased since the date of the last return


    N/A



6. Number of securities issued/allotted under scheme during period:


   352,374 ordinary shares of 10p each issued under the 2000 Scheme



7 Balance under scheme not yet issued/allotted at end of period



  3,156,406 ordinary shares 10p split



    1,459,691 - 1998 Scheme
   1,696,715 - 2000 Scheme



8. Number and class of securities originally listed and the date of  admission


2,200,000 ordinary shares of 10p each admitted on 5 November 2003

  1,700,000 ordinary shares of 10p each admitted on 9 June 2004

  5,000,000 ordinary shares of 10p each admitted on 11 October 2004

  4,859,883 ordinary shares of 10p each admitted on 30 November 2006

  3,500,000 ordinary shares of 10p each admitted on 23 March 2007



9. Total number of securities in issue at the end of the period


   719,866,101




Name of contact:



Richard Taylor


Address of contact



3rd Floor Building 11

Chiswick Park

566 Chiswick High Road

 London W4 5YS


Telephone number of contact 0208 996
1000



Signed by ...Richard Taylor

Director/company secretary/suitably experienced employee/duly authorised 
officer, for and on behalf of



Name of applicant ...Tullow Oil plc










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