UK Stocks-Factors to watch on Aug 7

Britain's FTSE 100 index is seen opening up 6 points at 7,670 on Tuesday, according to financial bookmakers. * BHP: Miner BHP said on Monday it had formally requested a period of government mediation with the union at its Escondida copper mine in Chile, the world's largest, hours before the union threatened to begin a walk-off. * MONDI: Mondi Plc acquired a controlling stake in Egypt's Suez Bags for 26.01 Egyptian pounds per share ($1.46), which implies an eq