The Prince of Wales says he will stop speaking on subjects he has a strong will for when he becomes king, because he is not "stupid".
He has campaigned on issues like the environment for decades, but says he would not do the same thing as the monarch.
Speaking on the BBC document for his 70th birthday, Prince Charles said the idea of continuing the intervention was "nonsense."
He said he would have to work under "constitutional parameters".
He campaigned on issues including the environment, nature protection, architecture and the use of GM crops.
& # 39; Completely different & # 39;
In the one-hour program he was asked what some people called his "meddling", but he said he always tried to remain "out of the political parties."
He said: "I think it is important to remember that there is only one place for one ruler at the same time, not two.
– So you can not be the same as the ruler if you are the Prince of Wales or heir.
"But the idea, somehow, that I will do exactly the same, if I have to succeed, is a complete nonsense, because these two situations – are completely different."
Asked if his social campaign would continue, he said, "No, it will not be. I'm not that stupid.
"I understand that this is a separate exercise that is independent, so of course I understand how everything should work."
John Bridcut, the creator of documentary films who for 12 months walked the royal throne, said that Prince Charles "seduced" a little by using the word meddling, and instead preferred to think of his interventions as "motivating."
The heir to the throne said: "If this mixing is worrying about inner cities, as I did 40 years ago, whether it is interfering, I am proud of it."
Nicholas Witchell, royal correspondent
He spent his adult life trying, as he put it, "to change." This has often led the Prince of Wales to speak on topics he deeply believes: the environment, GM crops, inner cities, architecture, education, homeopathic medicine and others.
Prince Charles was accused of "interfering". Sometimes it irritated government departments who had to respond to his cordial "black spiders" handwritten letters, raising, always polite, but often insistently, certain issues that the prince had pointed out.
All this aroused greater anxiety. Does Prince Charles fully appreciate that when he replaces his mother and becomes the king of Great Britain, these interventions will have to end?
Those who know him have been saying for years that he understands that there is a line that, as a sovereign, can not cross.
They said that he fully understands that as a king he would have to stop his "campaign".
Prince Charles always used to speak in public. It is said that any reference to how it will function as a monarch can be seen as a lack of respect for the mother.
However, with Queen, who was 93 years old, and with Prince Charles in connection with the 70th birthday celebrations, he finally said – publicly and clearly – that he recognizes that his interventions on public debate will have to end as soon as this only possible. he becomes king.
"You act," he says in the BBC document, "within constitutional parameters."
One can assume that his assurances will be heard with some relief in Whitehall and the corridors of power.
"He is brilliant"
Mr. Bridcut said: "People who think that they are wishing to be king are very wrong.
"It is not something that dies to set up, because it will inevitably rise up only after the mother's death."
He added that the Duchess of Cornwall, with whom interview is also given in the documentary, "emphasizes that this burden does not weigh heavily on his shoulders".
The BBC gained exclusive access to the film "Prince Charles", which ends on the 14th of November at the age of 70.
Appearing also in the program, Prince Cambridge said he would like his father to spend more time with his grandchildren – Prince George, Princess Charlotte and Prince Louis.
Prince William said: "when he is there, he is brilliant," but "we need him there as much as possible".
"People on his side"
Author Roger Harrabin, BBC environmental analyst
The prince has warned about decades of man-made climate change. At the time, it was controversial for some people, but now there is a scientific agreement on the threat.
He reasonably predicted the great loss of species with wild fauna. He campaigned against the destruction of rainforests and will be pleased with the recent focus on the impact of agriculture on forests, and thus on the climate.
His care for the soil seemed to some observers, but now it is acknowledged that many areas are experiencing a crisis of degradation and loss of soil.
In these matters, the mainstream flows towards the future monarch.
On GM crops, the prince remains in conflict with the scientific center.
On other hobby horses, such as homeopathy and architecture, he expressed an opinion rather than a fact – but he would still have some people on his side.
- Prince, son and heir: Charles At 70, will be shown at BBC One on Thursday, November 8 at 9:00 PM.