Utopia, Limited (1893) is a rare bird, and one that every Gilbert and Sullivan completist simply has to bag. The point of completism, of course, is to acquire an overview: if artists are truly original, everything they created should illuminate the whole. But what if a career tailed off, or ran to seed? It’s just going to be depressing, isn’t it? By the time they began their penultimate opera, Gilbert and Sullivan hadn’t collaborated for three years.