Thanks to a note by Chris in another thread, I discovered that there is currently a Nick Brandt exhibition in the Source Photographica Gallery in Brighton. It runs until 12th May 2010. I visited the exhibition yesterday. This is the best photography exhibition I have seen in quite a while. There are about 20-30 very large prints from the "A Shadow Falls" book on display. Highly recommended! Nick Brandt describes his technique in a recent thread.