The Duke and Duchess of Cambridge have launched their own YouTube channel with a slick promotional video.

The 25-second clip, posted on their social media channels on Wednesday opens with the couple relaxing on a sofa at home in Norfolk.

Pointing at the camera, the prince tells his wife to be careful what she says “because these guys are filming everything”, and a laughing Kate replies “I know”.

In a move likely to be seen as cementing their profile with young people who spend time on the site, William and Kate will appear in exclusive clips posted on the popular video sharing site in the coming months.

As a finale, Kate can be seen telling her husband “you don’t need to roll your Rs”.

The couple have also changed their Instagram handle to ‘Duke and Duchess of Cambridge’ from Kensington Royal as it was formerly, Tatler said.

Just last week, the Cambridges released a professionally shot video of their family at their Norfolk home and on sand dunes at a nearby beach.

The piece was published on their 10th wedding anniversary.

The video, issued on Wednesday, shows a succession of brief clips of the couple visiting Bhutan, with Kate trying her hand at archery, William flying a helicopter and the duchess meeting young children.

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William is also featured during a visit to the London-based homeless charity – The Passage – he supports as royal patron and the couple are seen looking at a billboard showcasing images from Kate’s Hold Still photographic project.

A laughing duchess is shown shearing sheep during a visit to a Lake District farm alongside a clip of William sat in the grounds of Kensington Palace with Sir David Attenborough as they promote the duke’s Earthshot environmental prize.

On Sunday, the couple released a new picture of Princess Charlotte to mark her sixth birthday.

The concept of the video sharing website was explained to the Queen by her granddaughters Princesses Beatrice and Eugenie before she launched her own channel on the platform in 2007 to promote the British monarchy.

Many YouTubers have turned posting videos to their channels into full-time careers, sometimes making a lucrative living.

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