On Mar 9, 7:29*pm, CJB wrote:

On Mar 8, 11:03*pm, (Simon Bradley)
wrote:

(Mudchute) wrote:
The Travelcard discount applies to anyone with a Travelcard for any
zones of any duration as long as it's valid at the time you're
making your journey.

Great, thanks.

What happens if the Travel Card is loaded onto an Oyster Card? CJB.

It's still valid for the third off discount.

From page 5 of TfL's guide to River Thames Boat Services:

---quote---
Travelcard holders
Many operators offer 1/3 off normal advertised adult and child fares
on production of a valid Travelcard or Oyster card, loaded with a
valid Travelcard, when purchasing a ticket. Some restrictions apply.
---/quote---

Source (PDF):
http://www.tfl.gov.uk/assets/downloads/river-guide.pdf