Does anyone know whether it's possible to predict what may or may not be coming up on this service?

I can't even tell when and how often the schedules are altered. Apparently, some of the offerings will be available for years to come whilst others have a matter of days left in which to view them.

If you pay enough attention to DVD releases (not even I do), then I suspect a pattern would begin to emerge that you'd be able to get a vague idea of the kinds of shows which may be coming up, but beyond that I'm afraid I have no clue.

I've got it, and it's pretty random.

It some times sink with what's broadcast e.g. DS9 season 4 when season 5 is on telly.

for some reason the IT crowd has vanished