Holding in Company

Tullow Oil PLC
7 June 2001


                                 SCHEDULE 10

                  NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company
Tullow Oil plc



2) Name of shareholder having a major interest
Schroder Investment Management Limited


3) Please state whether notification indicates that it is in respect of
holding of the shareholder named in 2 above or in respect of a
non-beneficial interest or in the case of an individual holder if it is a
holding of that person's spouse or children under the age of 18
As 2 above


4) Name of the registered holder(s) and, if more than one holder, the
number of shares held by each of them
Schroder Investment Management Limited


5) Number of shares/amount of stock acquired
N/A


6) Percentage of issued class
N/A


7) Number of shares/amount of stock disposed
N/A


8) Percentage of issued class
N/A


9) Class of security
Tullow Oil plc Ordinary Shares


10) Date of transaction
N/A


11) Date company informed
06/06/01


12) Total holding following this notification
52,720,692



13) Total percentage holding of issued class following this notification
14.96%


14) Any additional information
N/A


15) Name of contact and telephone number for queries
John Crowe [phone]


16) Name and signature of authorised company official responsible for
making this notification
Tom Hickey
Date of notification ...7 June..............2001....