UK Stocks-Factors to watch on May 16

May 16 (Reuters) - Britain's FTSE 100 index is seen opening broadly unchanged on Tuesday, according to financial bookmakers. * HSBC: HSBC Holdings Plc has settled claims by a group of U.S. bondholders that it conspired with rivals to rig the Libor benchmark interest rate, according to a New York court filing on Monday by the bondholders' attorneys. * BHP: BHP on Tuesday said it was disappointed with the latest salvo from Elliott Management which said the company was not open to