UK Stocks-Factors to watch on Oct 13

Oct 13 (Reuters) - Britain's FTSE 100 index is seen opening down 20-25 points, or 0.3-0.4 percent, on Thursday, according to financial bookmakers. * The UK blue chip index closed 0.7 percent lower at 7,024.01 points on Wednesday, partly hurt by currency moves which weighed on some of its global companies. * TESCO: Tesco, Britain's biggest grocery chain, has pulled dozens of Unilever brand products from its website after a disagreement over prices in the wake of a partly Brexit-dri