The Catch Up service allows you to search by day, channel, A-Z or genre (music, lifestyle etc). Until recently there was a "movies" genre where available films were listed, usually around 10 at any one time.
Now there is no "movies" genre and I can't see any films available on Catch Up.
I haven't been told about any change to this service (unlike the blurb Virgin sends each year to justify the next 10% price increase) and according to your online "help" people the absence of the "movies" genre means there is currently no content available. This has been the case for some time now, so I'm guessing Virgin has taken it away by stealth.