TO GO WITH STORY BY JACQUES KLOPP 
Telecoms Director Frank O'Callaghan works at his desk at his office in London on October 30, 2014 before heading to training to prepare for his fight at the "Brawl at the Hall" white-collar boxing event at York Hall on November 13. A growing number of City workers are ditching the tie and lacing up the gloves for "white-collar events". Frank O'Callaghan is a former soldier now working in telecoms; he began boxing eight months ago. For him, boxing is a way to keep fit, presents a personal challenge and provides the opportunity to blow off steam. AFP PHOTO / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)