General – http://www.tfl.gov.uk/tfl/gettingaround/taxiprivatehire/default.aspx
Stay Safe – http://www.tfl.gov.uk/tfl/gettingaround/taxisandminicabs/taxis/default.aspx
Citizens advice – http://www.adviceguide.org.uk/england/consumer_s/travel_leisure_and_food_e/consumer_transport_e/consumer_public_transport_e/consumer_taxis_e.htm