UK Stocks-Factors to watch on Tuesday May 26

LONDON, May 26 (Reuters) - Britain's FTSE 100 index is seen opening up 4 to 8 points, or 0.1 percent higher on Tuesday, according to financial bookmakers. For more on the factors affecting European stocks, please click on * Britain's top share index hit closed up 0.3 percent at 7,031.72 points at its highest level in 10 days on Friday, driven by a jump in network operator Vodafone's shares, which hit a 14-year high on the back of potential merger activity. * VODAFONE - Inves