Photographer Brian David Stevens has contributed to theartsdesk before, most notably with his subtly powerful gallery of Scottish dunescapes with a piquant political edge. Over on Bruichladdich's site, Joe Muggs talks to him about his latest project, a set of portraits of the home-built technology of Notting Hill Carnival's sound systems – and about his long-running project to document the faces of Those that are Left: the veterans of WWII, who he photographed each year on Armistice Day.