The royals marked the start of Mental Health Awareness Week by stopping every radio broadcast in the country with a message reaching roughly 20 million people.

The Duchess of Cambridge told listeners that “if you’re struggling, it’s important to talk,” as part of the “mental health minute” broadcast at 10.59 a.m.

Kensington Palace said it was the first time all national, local and community radio stations in the country had united behind one message.

In the footage, the Duke of Cambridge said: “We’re all connected. And sometimes just talking about how you’re feeling can make a big difference.

“So right now, let’s join together across the U.K. and reach out to someone.”

Former Doctor Who actor David Tennant and England soccer player Harry Kane were among the stars to join in the video, encouraging friends to look out for each other’s mental wellbeing.

Kate said: “If you’re struggling, it’s important to talk about it.

“Or if someone you know is acting differently, it’s OK to ask how they are.

“Use this moment to send a message.”

The message was part of the Heads Together campaign, originally launched by Prince William and Kate together with Prince Harry in 2017.

That year was the 20th anniversary of the death of Princess Diana and the brothers took the opportunity to talk in depth for the first time about the mental health impact of losing their mother.

Prince Harry admitted he had counseling sessions to help him recover after spending 20 years bottling up his feelings.

He told Daily Telegraph journalist Bryony Gordon: “I can safely say that losing my mum at the age of 12, and therefore shutting down all of my emotions for the last 20 years, has had a quite serious effect on not only my personal life but my work as well.”

He added: “I have probably been very close to a complete breakdown on numerous occasions when all sorts of grief and all sorts of lies and misconceptions and everything are coming to you from every angle.”

And Prince William spoke out against the “stiff upper lip,” which is strongly associated with the royal family and the British aristocracy, in an interview for charity CALM (the Campaign Against Living Miserably).

He said at the time: “There may be a time and a place for the ‘stiff upper lip’ but not at the expense of your health.”