AMSTERDAM (Reuters) – Workers at the BP PLC oil refinery in Rotterdam are threatening to strike if their pay demands in a new collective bargaining agreement are not met by noon on Nov. 14, fuelling concerns about a potential diesel shortage next month. The BP refinery in Rotterdam processes around 400,000 barrels of oil annually, and is an important supplier of diesel to Northern Europe. “If we don’t receive a reaction from BP about our ultimatum and our demands, then we will proceed to action,” said spokesman Jaap Bosma of the CNV union in an interview. CNV represents 440 of the 730 workers …