Mystery surrounds the departure of Camilla, Duchess of Cornwall, from her latest royal tour with Prince Charles.
In the film, Charles explained how he had developed the Prince of Wales role: "You have to make of it what you feel right".
The inside story of the wedding, which took place in St. George's Chapel at Windsor Castle, is part of a documentary to be aired later on Thursday marking the Prince of Wales' 70th birthday next week.
In contrast to his mother Queen Elizabeth II, who has remained above the political fray, Charles has tried to intervene in some issues of public concern, writing letters to ministers, speaking out about climate change and opposing an extension to the National Gallery in London. "I'm not that stupid". William says "we need him there as much as possible".
Prince Charles said the idea he would continue making interventions as king was nonsense, adding he would have to operate within constitutional parameters.
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The NBPA said the decision to not televise was because there wasn't a consensus among the players who could be affected . Added Curry: "Hopefully we're both the captains again and we can broadcast it to the world in real time ".
And with Prince Charles' 70th birthday right around the corner - on November 14, to be exact - William believes now is the flawless time. And he adds "I do realise that it is a separate exercise being sovereign".
Documentary filmmaker John Bridcut said that Charles preferred to think of his "meddling" as motivation. "I found myself in conflict with the conventional outlook which, as I discovered, is not exactly the most pleasant situation to find yourself".
Charles' wife Camilla also shared the bond he has with her grandchildren.
"If it's meddling to worry about the inner cities as I did 40 years ago. if that's meddling, I'm very proud of it", he said. "And I think it's one of the key lessons that he taught us". "You never think it is going to grow into anything at all, and the next thing you know, you're being dwarfed by it!"
Royal fans are eagerly awaiting the arrival of Prince Harry and Meghan Markle's first child, but there's some traditions and protocol that dictate how they can announce the birth.