Sexuality lies near the core of individual identity and that is certainly true of John, now Lord Browne, onetime chief executive of BP. His paranoia that his homosexuality should be repressed, or at least hidden, is fundamental to understanding how this 5ft 4in intellectual, who lived with his mother, came to rise to the top of the oil industry, how he transformed BP into one of the great British businesses of the past half-century, and how he fell from grace. He has also bravely made it the subject of his latest book, a personal plea that both companies and individuals should be more accepting and supportive of gay and lesbian people.