It was a day of carnage that left 56 people dead and a dark shadow for ever cast over the history of London. But for Jérôme Kerviel, the French rogue trader, 7/7 was the jackpot. Mr Kerviel, whose wild bets on the stock market ended with record losses, celebrated as Britain’s worst terror attack helped him to register a €500,000 profit and to continue a winning streak that brought him “orgasmic pleasure”. The trader made the confession as he told the newspaper Le Parisien how he had lost touch with reality in the pursuit of money-making at Société Générale, the...