Holding in Company

Tullow Oil PLC
30 October 2007



TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached :



TULLOW OIL PLC



2. Reason for the notification (please tick the appropriate box or boxes)



An acquisition or disposal of voting rights:
            ( X  )



An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (    )



An event changing the breakdown of voting rights:
    (    )



Other (please specify):
                      (   )



3. Full name of person(s) subject to the notification obligation :



Legal & General Group Plc (L&G)



4. Full name of shareholder(s) (if different from 3.):



Legal & General Assurance (Pensions Management) Limited (PMC)



5. Date of the transaction (and date on which the threshold is crossed or
reached if different) :



17 October 2007*



6. Date on which issuer notified:



    29 October 2007



7. Threshold(s) that is/are crossed or reached:



    From 3% - 4% (L&G)



8. Notified details:













A: Voting rights attached to shares


Class/type of shares if possible              Situation previous to the Triggering transaction
using the ISIN CODE
                                  Number of shares                   Number of voting Rights
Ord 10p
GB0001500809                       24,688,566                        24,688,556






Resulting situation after the triggering transaction


Class/type of shares if     Number of shares         Number of voting rights           % of voting rights
possible using the ISIN
CODE
                            Direct                   Direct       Indirect             Direct      Indirect


Ord 10p                      29,642,611               29,642,611                       4.12%

GB0001500809




B: Financial Instruments

Resulting situation after the triggering transaction (xii)


Type of         Expiration Date       Exercise/Conversion       Number of voting rights     % of voting rights
financial       (xiii)                Period/ Date (xiv)        that may be acquired if the
instrument                                                      instrument is exercised/
                                                                converted.






Total (A+B)
Number of voting rights        % of voting rights


29,642,611                     4.12%



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable (xv):



Legal & General Group Plc (Direct and Indirect) (Group)



Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and
Indirect)



Legal & General Investment Management Limited (Indirect) (LGIM)



Legal & General Group Plc (Direct) (L&G) (29,642,611 - 4.12% = LGAS, LGPL, &
PMC)


Legal & General Investment Management (Holdings)      Legal & General Insurance Holdings Limited (Direct)
Limited (Direct) (LGIMHD) (25,715,694 - 3.57% = PMC)  (LGIH)


Legal & General Assurance (Pensions Management)       Legal & General Assurance Society Limited (LGAS &
Limited (PMC) (25,715,694 - 3.57% = PMC)              LGPL)
                                                      Legal & General Pensions Limited (Direct) (LGPL)













Proxy Voting:



10. Name of the proxy holder:





11. Number of voting rights proxy holder will cease to hold:





12. Date on which proxy holder will cease to hold voting rights:





13. Additional information:



Notification using the total voting rights figure of 719,414,147



Please note that this notification has been delayed due to a large number of
disclosures required following a substantial amount of new business which has
come to L&G in the form of an in-specie transfer.





14. Contact name:



TOM HICKEY, COMPANY SECRETARY





15. Contact telephone number:



0208 996 1000







This announcement has been issued through the Companies Announcement Service of

                           The Irish Stock Exchange.






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