UK Stocks-Factors to watch on Aug. 26

Aug 26 (Reuters) - Britain's FTSE 100 index is seen opening flat, according to financial bookmakers. * The UK blue chip index closed down 0.3 percent at 6,816.90 points on Thursday, extending losses from the previous session as healthcare stocks dropped, though CRH rose after well-received results. * ROLLS-ROYCE: Japanese carrier ANA Holdings needs to replace damaged compressor blades in the Rolls-Royce engines powering its Boeing 787s, it said on Thursday, forcing it to cancel so