RE: Holding in Company

Tullow Oil PLC
06 October 2005

Tullow Oil plc ('the Company')



Holding in Company



06 October 2005









The Company has today been notified by Citigroup (for and on behalf of Standard
Life Group) that, following a purchase of 303,640 ordinary shares of 10p each in
the Company on 5 October 2005, Standard Life Group have a material interest in
19,500,692 shares representing 3.014% of the issued share capital of the
Company. The shares are registered as follows:







No of shares held                                 Registered Name



19,500,692                                          Vidacos Nominees















This announcement has been issued through the Companies Announcement Service of

                           The Irish Stock Exchange.














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