Quote from BP website-
"With our global headquarters in London and operations across the country, the UK is the hub of the entire BP business."

http://www.bp.com/sectiongenericarticle.do?categoryId=24@contentId=2000737.
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From links at that site:
"The BP group operates across six continents, and our products and services are aailable in more than 100 countries."
"London is where BP's corporate headquarters are located, and the UK is therefore a centre for trading, legal, finance and other mainstreram business functions. The UK is also home to three of BP's major global research and technology groups."
North America
"The BP group is the largest oil and gas producer and one of the largest gasoline retailers in the United States. We are the largest non-US company on the New York Stock Exchange. Our BP Alternative Energy business has an operations centre in Houston, and we also have solar manufacturing facilities in the USA."
http://www.bp.com/extendedsectiongenericarticle.do?categoryId=40&contentId=7061813
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Excerpts from BP press releases are found through the same sites.
Statements about payments to states are made there, but some press releases say no monies have actually been received.