UK Stocks-Factors to watch on Jan 13

Jan 13 (Reuters) - Britain's FTSE 100 index is seen opening 26 to 30 points higher, or as much as 0.4 percent, on Friday, according to financial bookmakers. * The UK blue chip index closed up 0.03 percent at 7297.37 points on Thursday, thinly extending to 13 days its record winning streak. * IAG/BRITISH AIRWAYS: British Airways "mixed fleet" cabin crew, who make up around 15 percent of BA's total cabin staff, are to stage a 72-hour pay strike from Thursday next week, their union Un