Barack Obama grilled by Prince Harry in Radio 4 interview

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Prince Harry has interviewed Barack Obama for BBC Radio 4's Today programme.

The interview is part of Harry's guest editorship of the programme and features the former US president sharing his memories of the day he left office and his hopes for his post-presidential life.

Kensington Palace said the interview was recorded in Toronto in September during the Invictus Games and will be broadcast on December 27.

Today tweeted a video clip showing Harry and Mr Obama warming up ahead of the chat, with the former president joking: "Do I need a British accent?"

Harry told his interviewee that if he used long pauses between answers he would probably get "the face".

When Harry showed him what he meant, Mr Obama said: "I don't want to see that face."

The palace said the conversation features Mr Obama talking about his plans to focus on cultivating the next generation of leadership through the Obama Foundation.

Harry, who was recently at the inaugural summit of the Obama Foundation in Chicago, has forged a strong bond with the Obamas, through his work with servicemen and his trips to America.

At this year's Invictus Games, Mr Obama reportedly quizzed Harry on his romance with Meghan Markle as they watched the wheelchair basketball.

Mr Obama was among those to congratulate Harry and Meghan on their engagement, writing on Twitter: "Michelle and I are delighted to congratulate Prince Harry and Meghan Markle on their engagement.

"We wish you a lifetime of joy and happiness together."