The scheme, which was launched in July 2010 and is being expanded this year into Wandsworth and Hammersmith and Fulham, has up to 40,000 hires a day. Last month the Mayor doubled its hire charges to £2 a day or £90 a year to raise up to £5 million extra a year. Leon Daniels, TfL managing director of surface transport, said 83 docking stations were empty for more than six hours each day.