A royal warrant is seen printed on a bottle of tomato sauce, manufactured by food company Heinz, at a cafe in central London, Britain, August 21, 2015. Every year Queen Elizabeth grants about 20 royal warrants, the gold emblem of the British monarchy, in a practice dating back to medieval times. The warrant holders can display the certificate and use the royal coat of arms in their marketing. The warrants lasting five years can help businesses break into new markets overseas, using their role as supplier to the royal family as a gauge of quality. On September 9, Queen Elizabeth will overtake Queen Victoria as Britain's longest-serving monarch. Picture taken August 21, 2015. REUTERS/Toby Melville