Re: Block Listing Review

Tullow Oil PLC
07 May 2004

                                   SCHEDULE 5

                        BLOCKLISTING SIX MONTHLY RETURN



1. Name of company


Tullow Oil plc



2. Name of scheme


Tullow Oil plc 1988 Executive Share Option Scheme ('1988 scheme')

Tullow Oil plc 1998 Executive Share Option Scheme (1998 scheme')



3. Period of return:


From      5 November 2003                            To     4 May 204



4. Number and class of shares(s) (amount of stock / debt security) not issued
under scheme


2,200,000 ordinary shares of 10p each



5. Number of shares issued / allotted under scheme during period:


Nil - 1988 Scheme

65,530 - 1998 Scheme



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


1,100,000 - 1988 Scheme

1,034,470 - 1998 Scheme



7. Number and class of share(s) (amount of stock / debt securities) originally
listed and the date of admission;


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

Ref RA/Tullow Oil plc/00014



Please confirm total number of shares in issue at the end of the period in order
for us to update our records


377,841,915



Contact for queries


Name             Tom Hickey


Address          Tullow Oil plc

                 5th Floor

                 30 Old Burlington Street

                 London W1S 3AR


Telephone        [phone]


















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