In his book, Mad Toffs, The British Upper Classes At Their Best And Worst, Patrick Scrivenor writes: ‘One of the Dukes of Devonshire… was one day buying silver at Asprey, when he noticed some circular silver rings. He turned to his steward and enquired of him what they were. “Those, your Grace, are napkin rings.” “A napkin ring?” “Your Grace, when the middle classes breakfast, they take a fresh napkin, and when they have finished, they fold it, roll it and place it through the ring. They use it again for luncheon, tea, and dinner. Only at the end of the day is it sent to be laundered.” The Duke was shocked. “They use the same napkin throughout the day?” “They do, Your Grace.” “My goodness,” said the Duke, “I…