Hiya, I'm pretty sure this is a "missing asset" fault but could be wrong...
Mission Impossible: Rogue Nation is available on Sky Cinema OD in HD-only, not SD. My understanding is that every film should be available at least in SD, with HD for the first-30days or whatever. (rights and wrongs of that, aside).
I've just checked our TiVo® and we're getting the same. The assets we upload to On Demand vary. You'll sometimes get a SD and HD version of a film, sometimes one or the other. In this instance it's not a fault.
Let me know if you get any more issues!
All the best.
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That's fair enough, and thanks for getting back. I only would say - just because you're getting the same wouldn't necessarily correlate with it being intentional, that could just as easily be indicative of a missing asset.