Prince Harry threatened to give Barack Obama "the face" if he gave long pauses in between answers during their radio interview.

Prince Harry

Prince Harry

The 33-year-old royal has pre-recorded an interview with the former US President for an upcoming segment on Radio 4's 'Today' programme, and in a sneak preview Harry was heard joking that he would warn Obama with a mock stare if he needed the 56-year-old politician to keep speaking.

In a video preview of their chat released on the Kensington Palace Twitter account, Obama said: "Do I have to speak faster? Because I'm a slow speaker. Do I need a British accent?"

Harry replied: "Not at all ... but if you start using long pauses between the answers you're probably going to get the face."

Obama responded: "Let me see the face."

Harry then put on a mock stare and Obama laughed, saying: "Oh OK, I don't want to see that face."

The flame-haired royal then returned to serious mode and explained some details about their interview.

He said: "As you know for the 40 minutes it's going to be a 20-minute package for the BBC for Christmas. We hope to use the whole thing as a podcast afterwards."

Obama replied: "It's going to be fine ... excellent."

Harry then admitted he was "nervous" about interviewing Obama.

He said: "You're excited about this, I'm nervous. That's what's quite funny."

Obama offered him a way out, saying: "I'll interview you if you want?"

But Harry politely declined.

He added: "No, no. Let's keep it this way, I'd much prefer that."

Harry will be the guest editor of the 'Today' show - Radio 4's early morning news and current affairs programme - on December 27 when his interview with Obama will be broadcast.

A tweet on the official Kensington Palace account stated: "Prince Harry's guest editorship of @BBCRadio4 Today programme on the 27th December will feature an interview with former US President @BarackObama. The interview focuses on their shared interest in building platforms for the next generation of young leaders.

"The conversation with @BarackObama includes his memories of the day he left office and his hopes for his post-presidential life, including his plans to focus on cultivating the next generation of leadership through the @ObamaFoundation.(sic)"

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