TWIDW Alert: The Christmas Invasion Airs 25 December On BBC One - Official
The BBC has announced that "The Christmas Invasion", this year's 60
minute Doctor Who Christmas special that will serve as David Tennant's
first episode, will actually premiere on Christmas Day on BBC One, the
prestige place for holiday programming on British TV. The broadcast
time for the episode has not yet been decided, as the Christmas
schedule is set somewhat closer to the day.
It has been assumed all along that the episode would air close to
Christmas. The recent announcement that the CBC in Canada would get
the episode on Monday 26 December had narrowed most speculation to
Christmas Eve (for the regular Saturday timeslot) or Christmas Day
(where the BBC's biggest specials air).
Benjamin Elliott - This Week In Doctor Who