Homophobia may be withering in offices and on the shopfloor but among Britain's business elite the closet remains firmly shut. At the global oil majors, routinely negotiating deals in countries not known for their tolerance of homosexuality, being openly gay is simply not an option...A recent survey of the country's top 100 most influential gay and lesbian people named only three chief executives willing to have their names published, led by Sir Michael Bishop, head of the airline BMI...Neither BP or Shell appear in Stonewall's [Workplace Equality] index, nor any of the global mining companies that make up a large part of the FTSE 100.