Britain has decided to cooperate with the United States in a bilateral agreement to release strategic oil stocks, two British sources said, in an effort to prevent high fuel prices derailing economic growth in an election year. A formal request from the United States to the UK to join forces in a release of oil from government-controlled reserves is expected "shortly" following a meeting on Wednesday in Washington between President Barack Obama and Prime Minister David Cameron, who discussed the issue, one source said. Britain would respond positively, the two sources said.