Ainsty Castings have cancelled and have been replaced by Hersant Military Books and Companion Miniatures. Ellerburn Armies, Scheltrum, Old Crow Models and SHQ have all confirmed that they will be attending.
Several clubs have confirmed that they will be bringing demonstration or public participation games.
Full details are on the Claymore 2006 page of the SESWC website. With any luck this should be the final lineup.