UK Stocks-Factors to watch on April 26

April 26 (Reuters) - Britain's FTSE 100 index is seen opening up 15 points, or 0.2 percent higher on Tuesday, according to financial bookmakers. For more on the factors affecting European stocks, please click on * The UK blue chip index ended 0.8 percent lower at 6,260.92 on Monday, led by sharp falls in mining and oil and gas stocks as investors voiced concerns about whether commodities-related assets could sustain a recent rally. * BHS: British department stores group BHS was p