On Sun, 24 Feb 2008 10:40:15 +0000, Michael wrote:

Which is why I reckon if you only travel by bus the normal bus cap would
be applied, rather than the lower railcard discounted one. Because you
cannot get a railcard discount on an all-day bus ticket (the bus cap)
but you can on a travelcard (the tube cap).

But you can buy the Travelcard with railcard discount, then use it
exclusively on buses, without going on the Tube...