I checked parental controls which were set to not restricted. For the Saturday in question, the 22nd, every other programme is listed. Missing is Dad's Army, 'Allo, 'Allo and the Tudors among others. I would be interested to know whether this is the same for all 7 day BBC iPlayer broadcasts, or just is a Sony bug.
Incidentally, when I went onto the BBC iPlayer again, I got the "Not enough memory" mesage. It looks as though I will need to clear this for each access whether or not I have downloaded any programme.