The cheapest way of travelling around London is the bus system which is divided into 4 zones. You can purchase an ‘All London’ bus guide at Central London Underground stations like Oxford Circus. At many other tube stations you can pick up a free bus guide for the specific part of London where you are staying.
The quickest way is to use the underground and the train, which are divided into zones 1-6. London has the oldest underground train system in the world, so come and experience the original! Not only that, but the London tube is the largest working system in the world with an award winning designed map that you can pick up at any tube station.