UPDATE 1-UK Stocks-Factors to watch on Feb 15

(Adds company news items, futures) Feb 15 (Reuters) - Britain's FTSE 100 index is seen opening up 26 points at 7294 on Wednesday, according to financial bookmakers, with futures up 0.35 percent ahead of the cash market open. * The blue chip FTSE 100 index ended slightly lower on Tuesday at 7,268.56, pausing after a five-day winning streak as Rolls-Royce tumbled after reporting a record loss. * EURONEXT: Euronext said its full-year core earnings stood stable, as the pan-Europea