I went from London Bridge to Charing Cross today, showing my Oyster card
at the manned barrier at Charing Cross. The man on duty told me to
touch it on the pad, but I refused pointing out that I had not touched
in (as I changed directly from a FCC train there). He asked me where I
had come from: London Bridge was obviously the correct answer, as he
then let me through. This does suggest that SE trains were being
selective in allowing Oyster card usage.

--
Clive Page