it works, but it takes around a minute to kick into life. channel also needs to be tv1 or tv2. at least, that's the case with freeview satellite... oh, and i run windows 7.
interesting story: the kids were watching a recorded show and i wanted to check the weather, so i interrupted them and hit the teletext button. it worked, but the weather was for around 2 weeks ago! i thought teletext had problems there for a while. the teletext data stream is obviously recorded alongside the normal recording.