Holding in Company

Tullow Oil PLC
24 May 2001

                                 SCHEDULE 10

                  NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company
Tullow Oil plc


2) Name of shareholder having a major interest
Schroders 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 Above


4) Name of the registered holder(s) and, if more than one holder, the
number of shares held by each of them
As Above


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
1,050,000


8) Percentage of issued class
0.03%


9) Class of security
Stg10p Ordinary Shares


10) Date of transaction
22/05/01


11) Date company informed
23/05/01


12) Total holding following this notification
55,778,560



13) Total percentage holding of issued class following this notification
15.83%


14) Any additional information
N/A


15) Name of contact and telephone number for queries
Tom Hickey ([phone])


16) Name and signature of authorised company official responsible for
making this notification
Tom Hickey
Date of notification .......24 May..........2001....