Britain's FTSE 100 index is seen opening up 27 points higher at 7,087 on Wednesday, according to financial bookmakers. * BHP: The world's biggest miner, BHP, said on Wednesday its first-quarter iron ore production rose 8 percent on strong Chinese demand for high-grade ore, but cut its fiscal 2019 guidance for copper production, citing outages at key mines. * ANGLO AMERICAN: Anglo American Plc should restart operations at its Brazilian Minas Rio iron ore mine i