A new Channel 5 documentary has seen royal experts shed light on the apparent ‘rivalry’ between Princess Diana and Sarah Ferguson…

According to the new film, which was aired at the weekend, Prince Charles once asked Princess Diana why she couldn’t be ‘more like’ Sarah Ferguson.

The documentary, called Royals at War, saw royal experts talking about the apparent rivalry between Diana and Sarah, who is affectionately known to the British public as Fergie.

Princess Diana married Prince Charles back in 1981 but, as everyone knows, their infamously turbulent marriage started to break down shortly before Prince Harry arrived in 1984.

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Meanwhile, Sarah Ferguson married into the royal family when she wed Prince Andrew in 1986, earning her the title Duchess of York.

According to the Channel 5 programme the women were firm friends at first, but it wasn’t long before cracks started to show in their friendship.

According to royal author Katie Nicholl the tensions between Diana and Sarah seemed from within the royal family… “There were examples of Charles apparently saying to Diana, ‘Why can’t you be more like Fergie?'”

According to the experts talking on the documentary, Diana apparently came to envy Fergie’s ability to throw herself into royal life and enjoy it…

Biographer Andrew Morton revealed, “Diana looked at Fergie and thought, ‘How on earth does she do it?’ She’s carriage-driving with Prince Phillip, she’s out shooting with Prince Charles, she’s just a bundle of energy… Diana got quite jealous of her.”

According to royal biographer Penny Junor, Fergie always felt happy around the royal family, “Fergie was the daughter of Prince Phillip’s polo manager,” she explained.

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“She was very comfortable in royal circles, and was very at home marrying into the family. The Royal Family is all about dogs and horses, and country sports. Diana just was an urban girl.”

You can catch up with the Channel 5 documentary Royals at War online on My 5.