EVEN 5000 years ago, Britons were an understated bunch. About 250 years before work began on Egypt’s ostentatious Great Pyramid of Giza, the early settlers of Orkney, off the north coast of Scotland, were building impressive stone chambers of their own – and burying them under mounds of dirt. Now, intensive laser scanning makes it possible to virtually peel away the mud, revealing one of those chambers in all its glory.