Business Green: The Mayor of London’s cycle hire scheme sponsored by Barclays Bank launches tomorrow with cycles available for pre-registered members from 6am. Mayor Boris Johnson, himself a keen cyclist, has enthusiastically fronted the schem which aims to generate up to 40,000 extra cycle trips a day in central London, reducing car journeys, easing congestion on public transport and helping citizens to lead healthier life styles. But the scheme is not cheap to use. The initial £3 joining …