The Queen will celebrate the 60th anniversary of her coronation at a festival showcasing leading British companies.
Organised by the Royal Warrant Holders Association, the event will feature more than 200 of the brands which have supplied goods or services for at least five years to the Households of the Queen, the Duke of Edinburgh or the Prince of Wales.
Over the next three evenings the gardens will also host a performance of music and dance highlighting cultural life during the Queen's six-decade reign.
Stars such as Dame Kiri Te Kanawa, Katherine Jenkins, Katie Melua and the English National Ballet will perform.
More top news
Three men from East London have been jailed for stealing vital life-saving equipment worth over £100,000 from fire stations.
A 19 year-old from South East London has pleaded guilty after he soiled himself and revealed where he had hidden packets of heroin.
Max Whitlock was greeted by hundreds of fans as he returned to his gym in Essex for the first time since winning double gold in Rio.