Paul Corfield wrote

I'm not going to publish it. I will take the basic concepts and
devise
a suitable "quiz" for people to have a go it if they want to. I'll
even
work out how well people did. Anyone here should be able to get to
the
answers using the TfL web pages or from past postings on this group.

It would be interesting to see if it can be answered using only the
information on wikipedia.

http://en.wikipedia.org/wiki/Oyster_card

--
Mike D