Barr create the famous Scottish soda Irn Bru, which is said to contain 32 different ingredients in its secret recipe.
The Queen officially opened the new facility, and she and William – who is titled the Earl of Strathearn in Scotland – were given a rundown on the history of the company and met employees to learn about the 140-year-old company’s place in local community life.
Barr, the Queen and the Duke of Cambridge traveled on to the official royal residence of Holyroodhouse in Edinburgh for the Ceremony of the Keys, the traditional welcome ceremony at the royal residence where she was officially welcomed to the Scottish capital by the Lord Provost, who offered Her Majesty the keys of the city.
Usually she hosts a garden party during Holyrood Week or Royal Week, but that has been ruled out because of the coronavirus pandemic.
A former senior aide at the palace told PEOPLE at the time, “Her family will step up and be by her side, but she will carry on.