Michael Lawrence, recently ousted chief executive of the London Stock Exchange, once made a proud boast. "I can speak," he said, "faster than most people think." On January 4 he put his eloquence to the test - and failed.Lawrence had just learned that the exchange's board was considering his future. He asked for, and obtained, permission to explain why he should keep his job. He obviously wasn't convincing. A vote was taken after he left the room, then exchange chairman John Kemp-Welch briefly explained the meeting's decision. "He was out in 15 minutes," recalls a source close to Lawrence. "He was summarily dismissed."Although Lawrence didn't know it, Kemp-Welch had called the non-executive board members the day before the meeting to inform them that the exchange's appointments and remuneration committee had recommended that he go. It happened that three of the committee's four members - top officials from BZW, Merrill Lynch,...