UK Stocks-Factors to watch on Sept. 21

Sept 21 (Reuters) - Britain's FTSE 100 index is seen opening up 8 points, or 0.1 percent on Wednesday, according to financial bookmakers. * The UK blue chip index closed up 0.3 percent at 6,830.79 points on Tuesday, lifted by gains in consumer goods stocks ranging from luxury fashion group Burberry to supermarket retailer Tesco. * BHP BILLITON: BHP Billiton Chief Executive Andrew Mackenzie's annual salary was cut in half following the Samarco dam disaster in Brazil that claimed 19