King Charles accused of ‘doing a Prince Harry’ with latest move

However, fellow royal expert Richard Fitzwilliams disagreed, stating: "I can't think of anything less like the Sussexes. Harmony... it's a philosophy of sustainability, of being at one with nature."

King Charles is set to star in a new feature-length documentary for Amazon Prime Video, with filming already underway at Dumfries House in Scotland.

The project will highlight the King's environmental charity work both in the UK and overseas.

The film is expected to be released in late 2025 or early 2026, according to The Times.

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The documentary will focus on concepts from the King's 2010 book "Harmony: A New Way of Looking At Our World," co-authored with Tony Juniper and Ian Skelly.

A Palace source told The Times the King was "greatly looking forward to seeing how the Harmony concept can be communicated to a new and international audience."

The book called for a "dramatic revolution" in how society approaches the natural world.

The collaboration with Amazon marks a significant departure for the Royal Family, who have traditionally worked with British networks for major on-screen appearances.

The Palace reportedly spoke with several streaming platforms before selecting Amazon Prime.

The only previous royal partnership with a major streaming service has been the Sussexes' multi-million pound deal with Netflix, which produced their 2022 docuseries "Harry & Meghan."

"This is a chance to 'show, not tell' how they can transform people, places, and ultimately the planet," a Palace source explained.

"I think many will be genuinely amazed at the scale, scope and vision of it all, for which Dumfries House continues to be the 'living laboratory'."

The source added: "It's astonishing what has been put into practice since publication of the original book, 15 years ago, and how many of those pioneering ideas have been adopted."