Complete and/or past series OnDemand are generally "box sets" and availability can vary. As new box-sets are made available, others are removed.
Anytime you're browsing OnDemand programmes, the final screen before you click "watch now" will flag "available until xyz" on the RHS if the series/programme is due to expire in the next couple of weeks.
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Only season 7 i can see is available on virgin, but a few weeks ago the whole series was available on demand on virgin, now it looks like only available on demand via sky/now. Clearly I’m paying for the wrong service then!!
now tv is a part of sky not virgin. at some point they won't have access and virgin will. that is the way it works. then the show may appear on netflix and so on. shows move between different platforms so the maximum profit can be made from a particular show.