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The newly formed British Olympic Association, presided over by William Grenfell, a silver medallist in the 1906 Athens Games, had only 10 months to organize the global multi-sport event.
BBC: The ghosts of London's Olympic past
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But the loss to Helenius, 25, a silver-medallist at the 2006 European Amateur Championships, saw Gammer slump to a 18-4-1 record and again question his future in the sport.
BBC: Gammer retires following defeat
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An American coach is also a possibility after the Olympic silver medallist spent a short time working in the gym with Roger Mayweather, uncle and trainer of Floyd Mayweather, during his recent trip to Las Vegas for the Calzaghe-Bernard Hopkins fight.
BBC: Khan appoints temporary trainer