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7 June 2011, 09:28 | Updated: 7 June 2011, 09:38
A dedicated team of trouble-shooters is being sent in to sort out problems with the Mayor's cycle hire scheme.
Transport for London's demanded the operators Serco sort out issues such as wrong bills being sent to users and bikes being locked in docking stations.
More than 4 million journeys have been made on the "Boris bikes" since the scheme was introduced last July.