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Exhibit
10.3
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Kerr-McGee
North Sea (U.K.) Limited
Ninian
House
Crawpell
Road
Altens
Aberdeen
AB12
3LG.
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30th
August 2005
Centrica
Resources Limited
Millstream
East
Maidenhead
Road
Windsor
Berkshire
SL4 5GD.
Dear
Sirs
We
refer to the sale and purchase agreement executed on 6th
August 2005 between Kerr-McGee North Sea (U.K.) Limited (“Kerr-McGee”) and
Centrica Resources Limited (“Centrica”) in respect of Kerr-McGee’s interests in
the Buckland Field (the “Buckland SPA”) and the sale and purchase agreement
executed on 6th
August 2005 between Kerr-McGee North Sea (U.K.) Limited and Centrica Resources
Limited in respect of Kerr-McGee’s interests in the Skene Field (the “Skene
SPA”).
In
order to more clearly reflect the intention of the parties we agree
that
(1)
with effect from 6th
August 2005 the text of Schedule 7 to the Buckland SPA shall be deleted and
replaced with the following text:
Buckland
Field
The
following interests held by Kerr-McGee North Sea (U.K.) Limited:
Kerr-McGee’s
thirty three decimal three three three three three three three percent
(33.3333333%) interest in UKCS Licence P.103 Area G and Area W, as Areas G
and W
are defined in the Restated Northern Waters Joint Operating Agreement dated
9th
November 1995 as amended.
(2)
with effect from 6th
August 2005 the text of Schedule 7 to the Skene SPA shall be deleted and
replaced with the following text:
Skene
Field
The
following interest held by Kerr-McGee North Sea (U.K.) Limited:
Kerr-McGee’s
thirty three decimal three three three three three three three percent
(33.3333333%) interest in UKCS Licence P.103 Area O, as Area O is defined in
the
Restated Northern Waters Joint Operating Agreement dated 9th November 1995
as
amended.
(3)
in respect of the Buckland SPA, the Base Consideration as therein defined shall
be allocated by Centrica between Areas G and W and a notice, supplemental to
that served on the Area G parties and the Area W parties on 10th
August 2005, shall be served by Kerr-McGee on the Area G parties and the Area
W
parties stating such allocated consideration.
Please
sign and return the enclosed copy of this letter indicating your agreement
to
it.
Yours
faithfully
TERENCE
JUPP
Kerr
McGee North Sea (UK) Limited
ANTHONY
C. HENSHAW
Agreed
for Centrica Resources Limited