On Wed, 11 Apr 2007 13:56:34 GMT, Bob Wood wrote:

If you have a registered Oyster card with no period Travelcard loaded
but with a positive PAYG balance, make a PAYG journey, and /later in
the same day/ buy a period Travelcard on that Oyster card, starting
that day, and covering the zones included in your initial PAYG
journey, will the PAYG journey be refunded?

No

In the days before Oystercards would you have expected to have travelled
in the morning and then had your fare refunded in the afternoon if you
bought a season ticket?

In the days before Oystercards, would you have expected to pay for a
single journey, later that day decide to make 10 more journeys, and
just pay the ODTC price (or less) for the lot?