Dec 22 Britain's FTSE 100 index is seen opening up 26 points, or 0.4 percent, on Tuesday, according to financial bookmakers, with futures up 0.54 percent ahead of the cash market open. For more on the factors affecting European stocks, please click on * The UK blue chip index closed 0.3 percent lower on Monday at 6,034.84, as losses in Spain and a rise in the euro weighed on European stock markets.