Royal Warrants are granted to companies who have regularly supplied goods or services for a minimum period of five years to HM The Queen, HRH The Duke of Edinburgh, or HRH The Prince of Wales. They are a mark of recognition that the holders are regular suppliers to the Royal Households. All companies have to pass stringent environmental criteria as part of holding their Warrant.
The Royal Warrant Holders Association was founded in 1840. The Head Office in London is supported by five local Associations based in Windsor, Aberdeen, Edinburgh, Highgrove, and Sandringham.
Sandringham Association was founded in 1979 and has over 100 members who supply the Royal Household. It supplements the parent Association by promoting relationships with the Sandringham Estate and holding local social and business events.