UK Business Update

Tullow Oil PLC
19 September 2006



Tullow Oil plc - UK Business Update




19 September 2006 - Tullow Oil plc (Tullow) announces that the Ketch-7
development well has been completed and tested at a rate of 45 mmscfd and that
the Schooner NW appraisal well has encountered gas in the targeted Carboniferous
reservoir section.



FIRST PRODUCTION FROM KETCH-7 (Tullow 100%)



The Ketch-7 horizontal production well, the second of the Schooner-Ketch
redevelopment programme, was spudded on 2 June 2006 and, having encountered 540
feet of net pay, has been completed and tested on schedule at a rate of 45
mmscfd.  The well, which encountered higher than expected reservoir pressures,
will now be connected to the Ketch production facilities and first production
through the Tullow-owned CMS infrastructure is scheduled to commence in early
October. The addition of Ketch-7 is expected to increase the production
capability of Schooner and Ketch to over 100 mmscfd.



The forward programme includes the 3,000 foot horizontal Ketch-8 well which
commenced drilling on 18 September, followed by Ketch-9.  Concurrent with the
drilling, well stimulation and remedial operations are in progress on other
Ketch wells to further enhance production.



SCHOONER NW APPRAISAL WELL (Tullow 90.35%)



The NW Schooner appraisal well, targeting an extension of the main Schooner
field, has encountered gas bearing reservoir sands.  The section has been logged
and indicates a net pay of some 275 feet.  The well is now being completed for
testing which is expected to commence at the end of September.  Should the test
yield commercial flow rates, the well will be suspended and the pipeline laid
for tie-in to the Schooner platform in mid-2007.

Commenting today, Aidan Heavey, Chief Executive of Tullow said:

'We are very pleased with the progress to date on the Schooner-Ketch
redevelopment programme and the encouraging results from the NW Schooner
appraisal well.  Since acquiring the fields in early 2005 we have significantly
improved reliability and uptime and are now materially enhancing production and
reserve potential. With the ongoing strength of UK gas pricing we are seeing
excellent returns from these assets.'



For further information contact:
Tullow Oil plc                 Citigate Dewe Rogerson         Murray Consultants
([phone])             ([phone])             ([phone])
                               Martin Jackson                 Joe Murray
Aidan Heavey
Tom Hickey
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 across 17 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 exploration and production 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, Congo (DRC), Madagascar, Angola and
Ghana.



In South Asia, Tullow has exploration and production 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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