(Sorry non-UK people, I don't think this is being shown elsewhere).
More4 have been showing an excellent documentary series the last few weeks called "The Story of Film: An Odyssey". Presented by Mark Cousins, its pretty much what it says on the tin - history of film, film techniques, commentary on the culture and current events throughout, and plenty of clips of films mentioned. It is a little slow in places, but once you get into it, well worth it.
Anyway, if you haven't been watching it live you can still catch the first episode on 4oD until the end of today (later episodes have a bit more time remaining!).The Story of Film on 4oD