>EDINBURGH, Scotland (AP) – Hundreds of workers at Scotland’s only oil refinery on Sunday began a 48-hour strike that has forced BP PLC to shut a pipeline system that delivers almost a third of Britain’s North Sea oil. BP said it had completed the closure of the Forties Pipeline System by 6 a.m., when 1,200 workers at the Grangemouth refinery in central Scotland walked off the job. The pipeline brings in 700,000 barrels of oil a day from the North Sea to BP’s Kinneil plant, which is powered from the Grangemouth site