There was some filming going on earlier today that some wonderful people got info, pictures and videos of, Hooray for them!
And this is what we've got:
David Tennant and Catherine Tate were there, running around as the TARDIS was set up but they were on the whole missed by the Who spotters.
BUT the main news is this:
We now have Rose Tyler in the finale, on her own, with a giant gun!
Jon from the DWF had this to say about it all. "what I saw was a short scene involving a crashed milk truck. Broken bottles strewn over the street. The milkman (actor's first name was "Andrew") was standing by his crashed truck. A wind machine was blowing nearby and Andrew had to turn and look up at something in the sky. A camera crane was overhead filming him from above."
And Mugim0e says this: "There was a milk float used in some of the filming earlier on. the crew were rocking the float in a scene. Billie was holding a very large gun and they took aerial shots of her looking up and cocking the gun."
Sorry, the quality is not brilliant, but you can clearly see Piper with her gun.
Jon: "Taking into account what I saw, and judging by mugim0e's photos of Billie, the sequence seems to be Rose with her big gun. She cocks it, then vanishes as she gets teleported/beamed up somewhere. A passing milkman sees this and crashes his truck. He gets out and turns to see something pass overhead (a spaceship) and fly off into the night sky."
(Thanks very much to Jon and Mugim0e for the photos, reports and videos!)