[TVFan]

I believe the schedule was changed in order to put a repeat of the first episode of Mamma Mia in yesterday, in an attempt to boost ratings, so the film was moved to today. Not sure what the original schedule was, but presumably they think Mamma Mia will get a better lead-in from Harry Potter than the news.

I think today originally had a different film instead of Harry Potter (after the schedule change it was moved earlier to 1pm), then the news and Mamma Mia.