Bugman's Bar
Bugman's is the GW HQ local pub, so local in fact that it is inside!! Just a short 5 second walk from the Warhammer World main hall is Bugman's Bar. Bugmans is a great place to hang out on the Friday before the Blood Bowl, catch up with friends and play a game or two of Blood Bowl, Beach Bowl, BB7's or what ever else you fancy. You will also find many people hanging out here between games, cursing or praising Nuffle, or denying his exisitence.
Rock City
Rock City seems to be the place to be on a Saturday night for all those with big boots (to tread on the broken glass), who want to drink lots and possibly miss the 1st game on Sunday with a hang over. Located just north of the main shopping area it is a short taxi ride from Warhammer world. I haven't been myself, but I'm planning on risking it this year. :)
Clarence Hotel Bar
The Clanence Hotel is a popular place to stay while vitising Nottingham for the Blood Bowl, and if you are staying there or are with someone how is then you can take advantage of the fact they will stay open late (very late)on Friday and Saturday night, as long as their are cutomers to serve (more than 1!). Usual Pub prices, and a pool table.