PARIS (Standard&Poor's) Oct. 8, 2007--Standard&Poor's Ratings Services said today that it revised its outlook on BP PLC, the U.K.-based international oil and gas super major, and its affiliates, to negative from stable. At the same, the 'AA+/A-1+' long- and short-term corporate credit ratings on BP and all ratings on related subsidiaries were affirmed. "The outlook revision follows continued subpar performance at a number of BP's major production and refining operations," said Standard&Poor's credit analyst Emmanuel Dubois-Pelerin. "The ratings continue to reflect BP's excellent asset base, notably upstream." Over the past two years, BP's traditionally strong operating performance has faltered on a series of operating issues affecting its core operations, especially in the U.S. These