Around the world, the kitchens, bedrooms and bathrooms of the population have something in common with many of the United Kingdom's royal palaces. They are often stocked with the same items personally selected by Her Majesty The Queen and other members of the Royal Family, marked by what's known as a royal warrant. Popular products such as HP Sauce, Kellogg's Corn Flakes, Burberry clothing, Clarins skin care or Elizabeth Arden cosmetics can all display a royal coat of arms, marking them as a product chosen by Her Majesty. But those seals of approval may evaporate following the Queen's death this…