While I was there in 2007 they had the Ford Anglia from Harry Potter on display. Unfortunately the photo I took didn't come out as well as I would have liked:
Funnily enough Corgi produced a scale diecast version of it, though it doesn't have the holes in the windscreen. It also looks a lot less battered than the real one in Warner:
In common with most of the film and TV items produced by Corgi it's currently not available from them directly, but I did manage to pick one up from an eBay vendor for next to nothing.