Well Test Update

Tullow Oil PLC
27 June 2006


News release


Tullow Oil Plc - Waraga-1 Well Test Update

27 June 2006 - Hardman Resources, the operator of the Waraga-1 well test in
Uganda, in which Tullow Oil Plc (Tullow) is a 50% partner, today issued the
following press release.



           Production Testing Update: Waraga-1 Oil Discovery, Uganda


Following our announcement on 22nd June concerning the flow rates from the
Waraga-1 well, Hardman has continued to test the lowermost zone over the
weekend. Following a shut-in period the well was flowed through a 1' choke at a
sustained flow rate of approximately 4,200 barrels of oil per day (bopd). As
reported previously the oil is light but waxy, with a low gas to oil ratio.
Pressure build-up tests indicate good permeability.

The current operation is preparing for testing of the two shallower oil-bearing
horizons in the well, the first of which will commence later this week, before
moving to the Mputa location.



For further information contact:

Tullow Oil plc                  Citigate Dewe Rogerson        Murray Consultants
([phone])              ([phone])            ([phone])
Tom Hickey                      Martin Jackson                Joe Murray
Angus McCoss
Chris Perry


Notes to Editors



Tullow is a leading independent oil & gas, exploration and production group,
quoted on the London and Irish Stock Exchanges (symbol: TLW) and is a
constituent of the FTSE 250 Index. The Group has interests in approximately 90
exploration and production licences in 15 countries and focuses on three core
areas: NW Europe, Africa and South Asia.



Tullow's NW Europe interests are primarily focused on gas in the UK Southern
North Sea where it has significant interests in the Caister-Murdoch System and
the Thames/Hewett areas and operates over 60% of its production.



In Africa, Tullow has production and exploration in Gabon, Cote d'Ivoire, Congo
(Brazzaville) and Equatorial Guinea and a large gas field development and
appraisal programme in Namibia. Tullow also has exploration programmes in
Mauritania, Senegal, Cameroon, Uganda, Madagascar and Angola.



In South Asia, Tullow has production and exploration interests in Pakistan and
Bangladesh and high impact exploration activities in India.

For further information please refer to our website at www.tullowoil.com



                                      ENDS




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