The Duke of Cambridge has said that fatherhood has made him realise "how precious life is", during a documentary about his father's Prince's Trust.

Prince William, father to Prince George and Princess Charlotte, spoke to Ant and Dec alongside his brother, Prince Harry.

William told the pair:

I'm a lot more emotional than I used to be, weirdly. I never used to get too wound up or worried about things.

Prince William

William and Harry also praised their father's charitable achievements and the "insurmountable amount of duty in him".

The Prince's Trust was set up in 1976 after the Prince of Wales left the Royal Naval. Concerned that too many people were being excluded from society, Charles used his severance pay of £7,400 to fund community projects which later led to formation of the charity.

It is now one of the leading youth charities in the country, and after 40 years has reportedly reached more than 825,000 young people in total.

The Prince of Wales talks to Ant and Dec about becoming a grandfather

The Duchess of Cornwall has also given what is believed to be her first televised interview for the 90-minute programme presented by Ant and Dec who are both ambassadors for the Trust.

Camilla praised the Prince of Wales for setting up his Prince's Trust and said he was still "passionate" about helping young people.

I think I'm really proud to be married to somebody who, 40 years ago, aged 27, had the vision to put it together - I mean it was an incredible idea then.

Camilla, Duchess of Cornwall

Asked how Charles still maintains his energy and enthusiasm, she replied: "I don't know, he just has that energy. You know if you're passionate about something you can do it, he cares so much about these young people."

When Ant And Dec Met The Prince: 40 Years Of The Prince's Trust, will be screened on ITV on Monday at 9pm.