Transportation

Automobile Association: Among other features, this motoring site offers information about its breakdown services and driving school.
Black Cab Services: Dial a Cab, Computer Cab (Now also called Comcab) Radio Taxi..
Britrail: Find out about buying Britrail passes.
British School of Motoring: Learn to drive on the left!
Eurostar: Find out about traveling on this popular train to Europe.
Gatwick Express: Train linking Victoria Station to Gatwick Airport.
National Express : A coach service operating in the UK and Europe.
Heathrow Express: Train linking Heathrow to Paddington Station.
London Transport A gateway to web sites for the London Underground (the Tube!), buses, and water transportation. A transportation route planner is promised.
Low Cost Airlines: Buzz, Easyjet, Go, Ryanair
RAC: This motoring association site offers information about its breakdown coverage and a very useful route planner.
Railtrack Information on London railways. Includes very useful timetables for train routes.
Thetrainline: Book train tickets online.
Thetube.com: Plan a journey using the London Underground (affectionately referred to as "the tube") and get a detailed map of your destination. This is a great site!
tfl.gov.uk: Maps out your journey, allows you to rent the Santander bikes, top off payment on your Oyster card

Hailo: Pre-book or instantly order a black cab
Uber: on demand car service
Addison Lee: local car service
City Mapper: maps your journey via tube, walking, bus and tells you the cost estimate of each

Mappy.com Enter a starting location and a destination and get detailed driving directions plus a map.
Multimap
Street Maps Type in an address and get a map--includes the greater London area.

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