A check for Film4
Confirm the film title and date on the current programme schedule. If your aim is to watch later, search the title separately and note the actual replay offer. A channel's film listing and an on-demand catalogue use different schedules.
Check the station edition
Record one programme and its scheduled local time on the broadcaster page. Compare it with the channel label and time displayed in your player.
Check the guide if the live feed works
If the programme matches the live edition but the guide is wrong, confirm the channel mapping before changing the device clock.