UK Stocks-Factors to watch on Sept 21

Sept 21 (Reuters) - Britain's FTSE 100 index is seen opening up 3 points at 7,274.6 on Thursday, according to financial bookmakers. * ANGLO AMERICAN: Volcan Investments, the family trust of the chairman of diversified miner Vedanta, on Wednesday said it was increasing its stake in Anglo American but did not intend to make a bid for the entire company. * HOCHSCHILD MINING: Precious metals miner Hochschild Mining Plc is doubling down on efforts to find early-stage mining projects