It was one of Her Majesty's final visits to the Glasgow area and a special moment for fans of Scotland's 'other' national drink.
On June 28, 2021, Queen Elizabeth II made her first official visit north of the border since the death of her husband, the Duke of Edinburgh, who had passed away two months earlier.
Accompanied by her grandson, Prince William, the Duke of Cambridge, the late monarch was given a tour of AG Barr's factory in Cumbernauld, where Irn-Bru is manufactured.
READ MORE: Moment The Queen launched Clyde-built QE2 captured in precious photos
Positively beaming, with a smile that was as wide as the Clyde, The Queen, then aged 95, met employees and local school children, as she officially opened the famous plant's new processing facility. The royals were also told about the company's long history, which goes back to 1901.
Her Majesty was in Scotland that week as part of her traditional annual trip for Holyrood Week.
During the tour, the Duke of Cambridge was asked by commercial director Jonathan Kemp if he had been a fan of the popular fizzy drink while a student at the University of St Andrews. Prince William replied that he hadn't, but had later been turned on to Irn-Bru while serving with the armed forces.
Sign up to our Glasgow Live nostalgia newsletters for more local history and heritage content straight to your inbox.
Press cameras caught the moment Prince William raised a glass. "Delicious," said the Duke, as he took a sip.
Later, Prince William was presented with a small jar containing the clear essence of Irn-Bru - the top secret mixture key to the drink's unique taste.
Having taken a long sniff, the Duke said: "I'm trying to guess what's in it, but that's quite hard, isn't it?"
"I'd love to tell you," replied upstream manager Colin Reilly. "This is a closely guarded secret."
Click on our gallery link below to view a selection of pictures from that memorable day.
READ MORE:
Unearthed Glasgow photos show Gorbals doctor who wrote of slum conditions in 1920s
Eight former Glasgow Woolies stores and what's there now
Unseen 1960s Glasgow photos of the Anderston Pyramid the focus of new exhibition
Ex-British Rail worker shares amazing 1980s images of Glasgow's railway stations
New BBC series to shed fresh light on Glasgow's Ice Cream Wars of the 1980s
