I forgot to mention, a lot of the good UK camera shops like Calumet are there, as well as the high street lot (Jessops, Jacobs), and they bring a good range of lenses with them.
Ideal if you're hunting for a new lens and aren't 100% sure, as they let you try out the lens on your camera (well the few people who asked seemed to have got a good reply).
Course if they don't, then the likes of Nikon, Sigma & Tamron are there too.
The Nikon stand staff were very good. They had a whole section where all their current range of boides was set out, and they had a good selection of lenses that you could mix & match with the bodies to 'play around' with.
When I went earlier this year, there was a whole section (and LONG queue) to get hands on with the D800, and also an section where they had put some of the BIG lenses out, like the 400/500/600mm (stuff you probably wouldn't get to use often)