15. No member of the Royal Family may act in a stage or motion picture.

Reason: To uphold the royal status’s honor and decency.
Exception: exclusive family get-togethers and altruistic activities
Upholding a royal’s honor, dignity, and reputation is crucial in the realm of the British monarchy. The purpose of this guideline is to protect the dignity and gravity of their positions and duties. The role of fictional characters played by royals on stage or in movies has the potential to devalue their status and muddy the lines between fact and fiction.
No member of the royal family is allowed to act in a film or on stage.
The way the royal family is portrayed in fictional stories has the potential to skew the perception of them as the personification of the history, values, and identity of the country. However, this rule does include some exceptions. For example, royals can take part in casual plays or skits that are meant for entertainment and do not carry the weight of a professional acting role during private family get-togethers or philanthropic events.