King Charles was less than impressed when planning his Royal Wedding to Diana as there was one edible detail he wanted to change immediately.

Diana and Charles tied the knot on July 29, 1981 (Image: Getty)

Millions of people watched the then Prince of Wales and Lady Diana tie the knot in a lavish ceremony at St Paul’s Cathedral on July 29, 1981 – but there was one edible detail that had to be swiftly altered because Charles “wasn’t happy”.

Dave Avery, the man who designed and made Prince Charles and Diana’s wedding cake for their big day, has revealed it was the prince who called him to make changes to the design – after Diana had approved it.

The head baker of the Royal Naval Cookery School, Dave, had designed the couple’s five-tier fruit cake which stood high at a tremendous 165cm.

Although Diana had first approved the designs with no changes, the baker then received word from the palace that Charles “wasn’t happy”. Speaking about the late Diana, Dave told Yahoo News: “She was beautiful. She was very pleasant, very polite, we had a few little chats.”

David Avery with the royal wedding cake (Image: Getty)

Thankfully, it wasn’t a criticism but a minor detail Charles wanted adding to the cake. As reported in the Mirror, in a documentary titled ‘Wedding of the Century’, the baker explained Charles wanted to add a military role to the cake – the Red Dragon symbol of Wales, which was Prince Charles’ call sign when he was flying helicopters with the Navy.

Dave’s final design was made up of five tiers and the bottom piece was so large that it took a whopping 12 hours to make. According to Wyza news, the cake creator was sworn to secrecy during the 14-weeks of making the cake, and was under pressure to make everything perfect.

Diana became the Princess of Wales when she married Charles at the age of 20 on July 29, 1981, at St. Paul’s Cathedral in London. Their wedding saw the largest TV audience for a wedding, with 750 million people in 74 different countries tuning in.

The pair separated in 1992 – before officially divorcing in 1996, one year before Diana died in a car crash in Paris.

Diana and Charles officially separated in 1992 (Image: Getty)

Millions also marvelled at Diana’s wedding dress which featured an incredible 25-foot train and was a closely guarded secret prior to her wedding day.

The dress was made with silk taffeta fabric and antique lace, billed as the perfect dress for a ‘fairytale’ wedding. The 19-year-old bride-to-be had personally selected designers David and Elizabeth Emanuel to create the gown featuring 10,000 pearls and a 25- foot train.

It is thought the late Diana first tried on the dress in secret in an underground vault in the lower levels of an old Coutts bank once used to protect Queen Elizabeth’s coffers. Today the underground spot is beneath the original Hard Rock Cafe’s Rock Shop in London.