BBC News: "Bus passengers in London will be able to make a second journey for free under a new system being launched by the capital's mayor.
Sadiq Khan said from 12 September a free second journey can be made within an hour of a fare being paid.
His office estimates 30 million bus journeys, currently costing £1.50 per passenger, will be made this way.
An Oyster or contactless payment card will need to be used to take advantage of the Hopper fare."
