In an unusually personal royal film, King Charles has asserted his belief in the need for human life to work in keeping with the natural world - saying he would not be deterred by critics or scepticism.
"This was the approach I was going to stick to, a course I set, and I wasn't going to be diverted," says the King, in the film Finding Harmony - A King's Vision, to be screened on Amazon's Prime Video next month.
King Charles and Queen Camilla attended the film's launch - in the first premiere held at Windsor Castle, with the spectacular Waterloo Chamber turned into a makeshift cinema.
Dame Judi Dench, Sir Rod Stewart, Sir Kenneth Branagh and Stanley Tucci were among the celebrities at the glitzy premiere.
The King's spokesman said this was a different kind of royal documentary - without any gold carriages or glittering crowns.
