At least in London, licensed minicabs are supposed to keep records, at least of every journey's date & time, pick up location, destination, and the driver. This

At least in London, licensed minicabs are supposed to keep records, at least of every journey's date & time, pick up location, destination, and the driver. This is enforced by the Public Carriage Office - a division of TfL, with quite hefty fines for companies and drivers that fail to comply.