In message , Arthur
Figgis writes

I would doubt that more than a small fraction of the population know
about that sort of thing,

Well, only a small fraction of the world population travels abroad, and
many of those that do so don't necessarily need information on local
transport arrangements. But the UK forums on tripadvisor have well over
a third of a million posts - and there will be more readers than
posters.

Plus, of course, modern guidebooks to London explain how Oyster works
for those who cannot (or choose not) to use the WWW for their research.

For those that just arrive in London without any prior research, tourist
information offices and most hotel receptionists are there to explain
how to use the transport system.

and even fewer would be willing to wade through the crud,
half-understood vs pedantic debates, and random asides on the average
forum.

You have clearly never used tripadvisor.

--
Paul Terry