Taxis are regulated throughout the United Kingdom, but the regulation of taxicabs in London is especially rigorous with regard to mechanical integrity and driver knowledge.
LTI TX2 cab
Hansom cab in 1904 outside the Royal Albert Hall, London
Until the late 1950s, vehicles licensed as London taxis were required to be provided with a luggage platform, open to the street, on the pavement (sidewalk) side, at the front, beside the driver, in place of the front passenger seat found on other passenger cars (including taxis licensed for use in other British cities).
A TX4 hackney carriage at Heathrow Airport Terminal 5
Taxicabs are available throughout the United Kingdom, and are regulated by local authorities.
Taxis of London
…a hackney carriage as a taxicab allowed to ply the streets looking for passengers to pick up, as opposed to private hire vehicles (sometimes called minicabs), which may pick up only passengers who have previously booked or who visit the taxi operator's office. In 1999, the first of a series of fuel cell…
Taxicab rank with "black cabs" outside Liverpool Lime Street railway station
A Ford Mondeo UK private minicab with company name and telephone number on each side
Hackney carriages in Leeds are white with black bumpers and bonnets