I assume you don't subscribe to Sky Cinema, but you may be able to check the listings yourself at Home > On Demand > Movies > Sky Cinema. It's been a while since I didn't have it, so not sure if the menu's hidden or not.
The other easy way is to use Home > Search & Explore > Search and enter "Har...." (my search picked up the vast majority just on the 3 letters. Pick any individual film, and scroll to Get Movie, then "Watch Now". Under "Watch Now", you can scroll down to "See all options" and every source of the programme will be listed.
Most of them seem to be PPV only, but it's a handy check for any boxset too.