Manchester. October 2014. 54 percent of Licensed vehicles fail test first time.

http://www.manchester.gov.uk/download/meetings/id/18020/5_consideration_of_the_adoption_of_an_addendum_to_the_hackney_carriage_vehicle_policy_and_private_hire_vehicle_proprietor_conditions_relating_to_the_provision_of_evidence_relating_to_the_servicingmaintaining_of_hackney_carriage_and_private_hire_vehicles