Commission Bernard Hogan-Howe told a Parliamentary committee on Tuesday that his department was reviewing the role of Royal Protection officers in the incident, in which Harry was photographed naked.

However, Hogan-Howe told the panel: "Our role is to maintain the security of our protected individual. They have to lead a normal life and we have to strike a balance between intrusion into their life and keeping them safe."

He added "there is a golden line that cannot be crossed, which is getting involved in the social lives of the principals."

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