192.com
Index of minicab firms in London.
http://www.192.com/directory.cfm/mini_cab/LONDON

Addison Lee
Moves people and parcels around London on scooters.
http://www.addisonlee.com/

Black Taxi Tours of London
Sightseeing in London with those who know it best - the city's taxi drivers.
http://www.blacktaxitours.co.uk/

Bugbugs
Cycle taxis.
http://www.bugbugs.co.uk/

Cab Numbers.com
Search for a minicab service near you.
http://taxi.uk.cabnumbers.com/

Cabwise
Simply text "HOME" to 60835 to receive the numbers of one local taxi and two local minicab firms.
http://www.london.gov.uk/cabwise/

Computer Cabs
Book a black cab online.
http://www.computercabs.co.uk/

Connect2Taxi
Dial one number and get connected to a local taxi company anywhere in the UK.
http://www.connect2taxi.co.uk/

Dial a Cab
Book a black cab. The firm also runs a female taxi card service for regular women customers, which allows them to book a cab without having to broadcast their address and telephone details.
http://www.dialacab.co.uk/personal/

Karma Kars
Chauffeur driven Indian Ambassador cars which have been decked out in Bollywood style!
http://www.karmakabs.com/

London Radio Cars
Book a minicab on the Web to anywhere in the UK.
http://www.londonradiocars.com/

Mayor of London - Safer Travel At Night
Stay safe by making sure you only travel in a black cab or licensed minicab. Click on the link for more details.
http://www.london.gov.uk/mayor/transport/minicabs/index.jsp

Public Carriage Office
The Public Carriage Office (PCO) is the body which represents and oversees London's black cabs. Its website includes a fare calculator, list of licensed operators, a history of the PCO and information about "The Knowledge".
http://www.pco.org.uk/ http://www.transportforlondon.gov.uk/pco/

Radio Taxis
Pre-book a black cab.
https://www.radiotaxis.net/radiot/booker/login/wwwindex.jsp

ScooterMAN
Be chauffeured home in your own car.
http://www.scooterman.co.uk/

Taxi Card
A subsidized scheme that allows mobility impaired Londoners to use a taxi, if they have difficulty using public transport.
http://www.taxicard.org.uk/

Train Taxi
An online guide to taxi services serving train, tram and metro stations all over the UK.
http://www.traintaxi.co.uk/

UK Student Life.com
Contains a great introduction to the famous London black cab.
http://www.ukstudentlife.com/Travel/Transport/Taxi.htm

U-Go
Approximate the cost of a London cab journey using this online fare calculator.
http://www.taxis.lastminute.com/

Virgin Limobike
A chauffeur driven motorbike service.
http://www.virgin.com/subsites/virginlimobike/

Visit London
Tips on using black cabs and private hire minicabs, and on avoiding illegal minicabs.
http://www.visitlondon.com/travel/taxis/

Where2Guv
Call a cab via the internet, email or text.
http://www.where2guv.com/

Zingo
Hail a safe and reliable licensed taxi by using your mobile phone.
http://www.zingotaxi.co.uk/