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FILE - Traditional porters at work at Billingsgate fish market in London, on Aug. 3, 2010. (AP Photo/Alastair Grant, File)

FILE - Traditional porters at work at Billingsgate fish market in London, on Aug. 3, 2010. (AP Photo/Alastair Grant, File)

FILE - A woman wheels away meat products bought at Smithfield meat market in London, on May 3, 2006. (AP Photo/Matt Dunham, File)

FILE - A woman wheels away meat products bought at Smithfield meat market in London, on May 3, 2006. (AP Photo/Matt Dunham, File)