Question: are travelcards valid on river buses?
Answer: Travelcards. You get 1/3 off the Thames Clippers River Bus and most sightseeing River Tours if you have a Travelcard. If you have a paper ticket, you need to show it to staff when buying your ticket. If your Travelcard is on your Oyster card, touch in on the yellow card reader to get the discounted fare.