UK Stocks-Factors to watch on Friday Nov 27

LONDON Nov 27 (Reuters) - Britain's FTSE 100 index is seen opening 21 points lower, or down 0.3 percent on Friday, according to financial bookmakers. For more on the factors affecting European stocks, please click on * The UK blue chip index closed 0.9 percent higher on Thursday at 6,391.13. * Britain's shopping streets, out-of-town malls and websites will be awash with discounted goods on Friday as shoppers chase "Black Friday" deals in a spending frenzy expected to top la