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Underground tickets are available at all underground stations. Tickets prices for the underground vary (36) to the distance you travel. The network is (37) into five zones, a central zone and four outer zones. (38) , the more zones you travel through, the more expensive your fare will be. You must buy your ticket before you start your journey from a ticket office or machine. Keep your ticket for (39) and collection at your destination. The easiest and most (40) way to travel around London is with a travel card. This gives you the (41) of London’s trains, tubes and buses in whichever zones you choose. It’s perfect for the visitor because one ticket (42) travel on the trains of Network Southeast with the underground, Dockland light railway and most of London buses. It’s more (43) than buying separate tickets for each journey. Travel cards are available from any train or tube station. (44) .You can travel anywhere you like within the vast 650-square-miletravel card area. No need to keep queuing for tickets or carry a pocketful of changes for ticket machines, just use whatever form of transportation suits you best for any combination of trips. (45) . Travel card season tickets include seven-day, monthly and annual tickets. (46) .