Up until recent months, soldiers were not permitted to grow their facial hair while in the British Army.

The guidelines were relaxed in March and beards and moustaches must be neat, properly groomed and will be routinely checked.

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Meanwhile, the Royal Air Force has permitted its personnel to sport facial hair since 2019, while the Royal Navy has allowed beards and moustaches for years.

Prince Harry wrote about asking his grandmother, the late Queen, for permission to keep his beard on his wedding day to Meghan Markle in 2018.

But Harry claimed in his memoir Spare, released in January 2023, that William “bristled” when he explained that keeping his beard made him feel calmer.

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“Maybe it was Freudian – beard as security blanket. Maybe it was Jungian – beard as mask. Whatever, it made me calmer, and I wanted to feel as calm as possible on the day of my wedding,” he wrote.

He claims that William told him: “Not the done thing, he said. Military, rules, so forth.”

Harry wrote that his brother “wouldn’t let it go” and that the disagreement continued “in person, on the phone, for more than a week” before William admitted that his grievance with Harry’s facial hair was because he wasn’t allowed to keep his.