I'm watching the Google Video version, and I just noticed something. I know how Garrett has talked about some Calvert shots having been done by Williams' London team (sans Williams), and I think I found another one: The "consult the Brigand's Handbook" shot. It's definitely Williams pencils (which we see in partially unfinished pencil-test form in the workprint), like some of the other London Calvert shots. Unfortunately, unlike the Thief looking at the bubbles, or the Thief stealing the film, it's obviously on twos. (Just compare the background characters to the corresponding pencil-test footage in the workprint.) Even so, it runs circles around the Los Angeles animation (especially the L.A. animation's Korean ink and paint work). And note in particular the lighting and cinematography, two big reasons why I think it's the London team.

Anyway, here's a comparison I did between that shot, and the next shot we see of the Brigands after the scene with the caravan:

http://img487.imageshack.us/img487/7876/twofacesofcalvertnd1.jpg

I think the image speaks for itself...