UK Stocks-Factors to watch on August 25

(Adds futures) LONDON, Aug 25 (Reuters) - Britain's FTSE 100 index is seen opening up by 61-66 points or 1-1.1 percent higher on Tuesday, according to financial bookmakers. Futures were up 1.1 percent ahead of the cash market open. For more on the factors affecting European stocks, please click on * The UK blue-chip index closed down 4.7 percent to 5,898.87 points on Monday, hitting its lowest level since late 2012, with all stocks but one in the red and miners leading the sli