In October 1986 London's financial heart, the Stock Exchange, underwent one of the biggest shake-ups in its history. Old-fashioned practices such as the long lunches and early train home, gave way to new ways of working, and to the computer. Susan Hulme has been hearing from former stockbroker, Justin Urquhart Stewart, about the impact of those changes.Photo: Traders in the London Stock Exchange, Aug 1984 (Victor Blackman/Express/Getty Images)