Outspoken Prince Charles vows not to be a 'meddlesome' future king

Prince Charles, who is known for his candour on environmental and other issues as the heir to the British throne, has promised not to be as outspoken when he becomes king saying he is "not that stupid".

The royal, who celebrates his 70th birthday on November 14, spoke at length about how he sees the role of the monarch compared to that of being heir to the throne during a special BBC documentary 'Prince, Son & Heir Charles at 70' to be aired in the UK on Thursday night.

Asked if his public campaigning on issues close to his heart will continue when he succeeds his mother Queen Elizabeth II, he said, "No, it won't. I'm not that stupid".

"I do realise that it is a separate exercise being sovereign. So, of course, I understand entirely how that should operate," he said.

The monarch's role in Britain is expected to be neutral and apolitical, with the royal family expected to refrain from expressing very strong opinions on governmental issues.

Prince Charles has become well known over the years for his strong views on issues such as climate change, the environment, architecture and support for young people.

Applauded by some for his dedication and campaigning spirit, the royal has been criticised by others for trying to influence government policy.

When the prince, who has been the heir to the British throne since the age of four, was asked about his opinion on being seen as a "meddlesome" Prince of Wales, he replied, "Really? You don't say. But I always wonder what meddling is, I mean I always thought it was motivating."