Public Carriage Office

From the Wikipedia page on taxicabs

Regulation of the Taxicab trade passed to the Metropolitan Police in 1850 and was undertaken by the Public Carriage Office, which was originally in an annex to New Scotland Yard in Whitehall called "the Bungalow". It moved to 109 Lambeth Road in 1919, remaining there until 1966, when it moved to 15 Penton Street, Islington. In 2010 it moved again to the Palestra Building at 197 Blackfriars Road, Southwark.

On the formation of Transport for London on 3 July 2000, the licensing authority changed; however, the day-to-day licensing function remained with the Public Carriage Office.

With the introduction of the Private Hire Vehicles (London) Act 1998 the role of the PCO has been expanded to include the licensing of private hire operators, drivers and vehicles, bringing the capital into line with the rest of England and Wales.

In November 2005, in the report Where to, Guv?, the London Assembly's Transport Committee reported on a review of the Public Carriage Office and made some key recommendations.