Oyster Cards / Travelcards, London
London is an interesting City, even if it lacks the beauty of Paris. You might as well buy a travel card early as you will get fed up with walking - You can get everywhere quite quickly as the trains are usually every couple of minutes - you can still have a feeling that you are somewhere special even when the trains are delayed, as there is a lot of history in the architecture some of the central stations. A one day travelcard costs around £4.5 ($7USD) and you can use this on all the buses as well.
UNDERGROUND: Day tickets for the underground and buses can be purchased after 9:30am for a reasonable price. This usually end up cheaper than buying individual tickets, and it gives you the freedom to travel anywhere. Do be careful if you need to get anywhere quickly on the underground, as people frequently throw themselves in front of the trains. This can cause long delays as they try and scrape the brains off the advertising posters. You don't want this to happen when you have limited time before your flight departs from Heathrow. Web site: http://www.londontransport.co.uk/
If you're day-tripping in London I do recommend buying a One-day Travelcard which is valid for all forms of transportation and you can even get to Heathrow Airport with it. It costs about 5 Pounds but it depends on how many zones it is valid for.
If you buy a day ticket you can hop on and off as you please! They are also valid for the tube as well. So it is best to buy a one day travel card from the tube station as previously mentioned and then your journey begins.
Alternatively, if you specifically want to see the sights as in Buckingham Palace, Harrods etc you can pay I think it is arounf £8-12 to catch a tourist bus that drives round the sites and you can hop on and off as you please.
a plastic card that is prepaid, can be topped up at anytime.
the last visit, we bought a 7 day, kept us going from Heathrow and back to Heathrow.
Tube and bus
travel card in london is essential!
it gives the way to catch busses and tubes in the different zones .
it 's convenient,too.
If you are on a budget just get a £3 bus pass from a vending machine and hop on and off regular buses as much as you like.
If you are new to London get a one day bus pass from any newspaper shop,then whole London is yours to travel freely all day..
Buy a travelcard and hop on and off the buses and the (metro,subway) under ground or tube as we call it.
We bought cards that allowed us to travel using the underground. It is a great way to get around in the city.
Tubes work wery well, 20h everyday. Off-season 1 day travel ticket costed 5£ and a weekend one 7,5£ (all zones 1-6)
My favourite transportation in London. I bought a 'One Day Pass' ticket, Amazing: I can hop on and hop off as I like, no need to wait for bus stop!