According to AFP:
Royal Warrants are granted to people or companies who regularly supply goods for a minimum of five consecutive years to Queen Elizabeth….
Companies with warrants…feature the coat of arms..on their packaging…
“The Royal Warrant is…especially valued in…the Middle East, Far East, US and Commonwealth countries,” said Richard Peck, secretary of the Royal Warrant Holders Association.
“There is a perception that a company granted a Royal Warrant is expensive, but the converse is true. To retain the Royal Warrant companies must consistently demonstrate value for money, a quality product and reliable and flexible service,” he said.