One of the pledges made by Sadiq Khan during his mayoral campaign was to introduce a one hour bus hopper facility. By 2018 TfL hope to allow unlimited bus and tram journeys within the hour, but from next Monday, 12th September, it will be possible to make two journeys while only paying for one.
A second touch on a bus or tram within one hour of the first touch will not charge a new fare. After an hour (or after two touches) another touch on a bus or tram will charge a new fare. The daily bus cap still applies, so all bus and tram journeys after the first three chargeable ones are free – but you must still touch in.
One final note – just as a bus will break a multi-leg train journey, using a train will break a bus hopper so you’ll be charged another fare even if it is within one hour, unless you’ve reached a cap for the day. There is also a problem at Wimbledon where a bus journey after leaving the tram system will be charged, but if it shouldn’t have been it will be automatically refunded a few days later. Both these issues are expected to be fixed when the full bus hopper is rolled out in 2018.