On Jul 30, 9:34*pm, achengms
wrote:
Is there some sort of pass that I can buy for the London underground? I
will be in the city for about 20 days and will have to travel quite a
lot within the city hence was thinking of getting a pass or smart card I
can use in daily transport.

Yes. You've basically got two options, buy three weekly Travelcards or
otherwise use Oyster Pay-as-you-go (Oyster is a smartcard).

You can also load weekly Travelcard on to an Oyster card which would
allow you to travel outside the zones covered by your Travelcard - for
example to go to and from destinations in outer London such as
Heathrow airport or Hampton Court (if your weekly Travelcard just
covered the central zones 1&2). To do this you would need to add some
extra credit to the card for these journeys.

Note that the "Travelcard" name can cause some confusion - it's a
ticketing product that can be issued either on a physical (paper/card)
ticket or otherwise 'virtually' by being loaded onto an Oyster smart
card. Both the Travelcard and Oyster Pay-as-you-go are valid on the
Underground, buses and the suburban rail network in London.

Which one to go for kinda depends on how much travelling around London
you expect to be doing, where in London you expect to want to go to,
and how many days if any you might be away from London. That said, the
three weekly Travelcards might be your best bet.