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By Steve Slater LONDON (IFR) - Bang! It was the explosion in financial markets heard across the world 30 years ago which transformed the City of London from a cosy network of long-established firms into a cut-throat landscape dominated by foreign banks. This week is the 30th anniversary of Big Bang, a package of reforms across the securities industry that shaped the City that exists today, putting London alongside New York as the world's two dominant financial centres. International firms that arrived on the back of Big Bang are considering whether to stick with London or move operations and jobs elsewhere following Britain's vote in June to leave the European Union.