Princess Diana would regularly break royal protocol when it come to a particular thing but there was one occasion which frustrated King Charles.

King Charles was once left frustrated after his former wife, Princess Diana, broke royal protocol, according to the late Princess of Wales herself.

The Royal Family have many rules in place that dictate their every move. One of these rules is that they traditionally only wear black at funerals or during periods of mourning.

It is even essential for them to always travel with a black outfit as a precautionary measure for the purposes of mourning.

Famously, the late Queen Elizabeth was touring Kenya in 1952 when she found out George VI died and she had become Queen.

But she had not packed a black outfit with her which meant a member of staff had to deliver one to wear as soon as she touched down in the UK.

However, the late Princess of Wales was known to regularly break this rule as she was pictured in black outfits several times.