UK Stocks-Factors to watch on Aug 15

Aug 15 (Reuters) - Britain's FTSE 100 index is seen opening slightly up on Monday, according to financial bookmakers. * The UK blue chip index closed flat in percentage terms at 6,916.02 points as the top share index steadied on Friday after reaching a 14-month high, though mining stocks fell following a weak set of data from China. * GLENCORE: Swiss-based mining and trading firm Glencore said it would begin arbitration proceedings against Bolivia over the nationalization of some o