Traders and clerks react at the London Metal Exchange in the City of London

 
Traders and clerks react at the London Metal Exchange in the City of London
Traders and clerks react on the floor of the London Metal Exchange in the City of London in a February 14, 2012 file photo. As bidders circle around the LME - which is due to accept binding takeover offers by May 7 - the exchange may have to tackle questions over its rules to guard against market abuse and its transparency of market data. REUTERS/Luke MacGregor/files (BRITAIN - Tags: BUSINESS COMMODITIES)