We imagine we know how the unimaginably wealthy live—in a cocoon of bling and indulgence—but few of us get the chance to see for ourselves. The superrich hog a big chunk of the world’s commodities, ...

Hyde Park, and the queue for the toilets stretches back into mist, through a swamp of urine and a patchwork of discarded food wrappers and paper cups that would send Wall-E on a killing spree. On it ...