Some Cockneys Vs Zombies filming pics have popped up online. There are spoilers in the descriptions and photos, so it's up to you whether you want to go and have a look, you have been warned!
Two newspapers had people taking pics from a distance during some of the location filming. First one was this article in The Sun, with a couple of really good pics. Second one was The Daily Mail, with even more pics. Both are a bit spoilery, but they've got quite a few plot details wrong so you can safely ignore the text.
And io9 have this really good article about the shoot, with proper plot info from the press release, pics, and a video made by some of the zombie extras.