Blocklisting Interim Review

Tullow Oil PLC
06 November 2006

                        BLOCKLISTING SIX MONTHLY RETURN

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

To:  The FSA
     The Irish Stock Exchange

Date: 6 November 2006


1. Name of applicant:

   Tullow Oil plc

2. Name of schemes

   Tullow Oil 1988 Executive Share Option Scheme ('1988 Scheme')
   Tullow Oil 1998 Executive Share Option Scheme ('1998 Scheme')
   Tullow Oil 2000 Executive Share Option Scheme ('2000 Scheme')

3. Period of return:

From:     5 May 2006        To:    4 November 2006

4. Balance under scheme from previous return:

   5,681,306 ordinary shares of 10p each split

   1,174,072 - 1988 Scheme
   1,651,361 - 1998 Scheme
   2,835,873 - 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:

   2,579,798 ordinary shares of 10p each split

    1,078,072 - 1988 Scheme
            0 - 1998 Scheme
    1,501,726 - 2000 Scheme

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

  3,181,722 ordinary shares 10p split

        96,000 - 1988 Scheme
     1,651,361 - 1998 Scheme
     1,334,147 - 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

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

   651,442,182


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

If you knowingly or recklessly give false or misleading information you may be 
liable to prosecution.


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