Next year we will see this on the Tube and the Docklands Light Railway (DLR) but for now though it won't be included in the daily fare cap, which means passengers never spend more than the price of an equivalent Day Travelcard.

BBC: The beginning of the end of cash and the paper ticket?

But the contactless payment system will not include daily price capping, which means if it is used several times in one day it will not stop charging once a passenger reaches the cost of daily travelcard.

BBC: London buses offer contactless card payment