By City A.M. Reporter This week, a memorial service will be held to mark the passing of John Bridges, a long-time stalwart of the City. His daughter writes for City A.M. on a true gentleman of the Square Mile John started work in the City of London in 1959, becoming a talented stockbroker and making partner by the age of 28. But he saw a career set-back when his firm, Tustain L’Estrange, was one of a number that went bankrupt during an oil price crisis in 1974. As his wife had been one of the first cohort of women to pass the Stock Exchange exams not long previously, he was quoted in the press…