d wrote in
:

Fine, but HEX should not display signs which imply that their
tickets are the only ones which are valid on the route and that,
despite advance information to the contrary, travelcards or other
London Underground tickets are not valid. If such signs are normally
displayed, they should be covered or turned off during times when LT
tickets are valid.

Why not? It's up to TfL to tell its customers that they can use HEx,
not for HEx to tell everyone they can buy cheaper tickets from TfL. I
thought that would be obvious.

I can understand HEx not publicising the fact that there are cheaper fares
available, although I'd have thought that there might be similar rules to
the "Other listings magazines are available" caption that you often get on
BBC trailers about Radio Times.

However displaying posters/signs that contradict information that TfL has
provided is very different. That's not just witholding information. It's
lying. It leaves passengers wondering who to believe: TfL who say that their
tickets are being accepted on HEx trains or HEx who say that travel cards
are not being accepted.