At 9PM tonight FilmFour will join the Freeview line-up over DVB-T as a Free to Air on channel 31. Last night I was looking through my guide and noticed that my guide data was showing as not available, to my surprise there was actually guide data for it! However because the service name being broadcast on DVB-T and the name in the BDS guide feed don’t match (FilmFour vs. Film4) the connection wasn’t made. I don't think there is much blame to place for this one, the official FilmFour site can't decided which one it is :)
If you need to manually add the guide listings start Media Center
1) Select Settings > TV > Guide > Add Listings to Channel
2) Select ‘FilmFour’ (Channel 31)
3) Select ‘Film4’
4) Select Save
Official Site