 London minicabs are now licensed by TFL (London Taxis and Private Hire), or LTPH, formerly known as the Public Carriage Office.This is the same body that now regulates London's licensed taxicabs, but minicab drivers do not have to complete The Knowledge, and although they must undergo a small "topographical test" in order to obtain a Private Hire Drivers Licence, they generally rely on satnavs or local knowledge to take them to the pick up and destination.All vehicles available for pre-booking by London minicab drivers must hold a PH licence showing that the vehicles are fit for purpose; this is updated with MOT tests twice a year after an inspection at a licensed garage.