British financier Nathaniel Rothschild arrives at the Annual General Meeting (AGM) for coal firm Bumi PLC in central London, on February 21, 2013. Nathaniel Rothschild's bid for control of London-listed coal firm Bumi Plc may face a challenge as a major stakeholder sold 13 percent of voting rights ahead of a crucial shareholders' meeting.  AFP PHOTO / WILL OLIVER        (Photo credit should read WILL OLIVER/AFP/Getty Images)