UK Stocks-Factors to watch on March 20

March 20 (Reuters) - Britain's FTSE 100 index is seen opening 1 point higher at 7,426 on Monday, according to financial bookmakers. * The UK blue chip FTSE 100 index ended 0.1 percent higher at 7,424.96 points on Friday, closing at a record level but with a stronger sterling capping gains. * UNILEVER: Unilever is preparing a 6 billion pound ($7.44 billion) sale of some of its food brands, British newspapers reported on Saturday. * BHP BILLITON: The labor union at the world's