This excerpt taken from the BP 20-F filed Mar 4, 2008.
Acquisitions in 2005
BP made a number of acquisitions in 2005 for a total consideration of $84 million. No significant fair value adjustments were made to the acquired assets and liabilities. Goodwill of $27 million arose on these acquisitions. Also in 2005, additional goodwill of $59 million was recognized relating to the 2004 acquisition from Solvay of the remaining interests in two equity-accounted entities. This goodwill arose due to final closing adjustments and selling costs and was written off.