A lot of the time with VOD I find I get a VOD is not available message. Catch up TV is hit and miss in that you cannot depend on what is available. Some days there is a lot, others just a couple of programs, other days nothing.
It's in the lap of the gods whether you will have to reboot your STB on returning to TV if you have been lucky enough to have actually got VOD to work.
If you haven't got it, you are missing nothing and don't waste a fiver on it cause it just ain't worth it.
VOD seemed to promise a lot but because of what seems to be the usual half-assed implementation it's just a waste of space at the moment.