In the UK, the term minicab is used to refer to a private hire car; that is a car with a driver available for hire only on a pre-booked basis. They began operating in the 1960s in competition to hackney carriages after a loophole in the law was spotted (although in some areas it is possible to hold a dual hackney/private hire licence). A minicab must be pre-booked, for example, by telephone, internet, or fax; or in person at the registered minicab office. One can book at the time at which one needs the minicab but only with a company registered to accept bookings rather than directly with one of its drivers.

Since 2001, minicabs have been regulated in London and most other local authorities. London minicabs are now licensed by the Public Carriage Office, the same body that regulates London black taxicabs. All vehicles available for hire by London minicab drivers must also hold a Public Carriage Office licence showing that they are fit for purpose. This is updated twice a year after an inspection at a licensed garage.