The pair are firm friends and have fostered a so-called “bromance” with numerous public appearances together over the years.

But when a slightly awkward Prince Harry came to interview Barack Obama for his stint as a guest editor on BBC Radio 4’s Today programme, he admitted he was nervous, prompting the former US President to reassure him it was all a bit of fun.

As the pair came face to face on camera, sitting across a table from each other behind the radio microphones, Mr Obama jokingly asked the Prince if he should speak with a British accent.

He also wondered if he should speak faster than usual because he was a “slow speaker.”

But the Prince replied: “No, no not at all. But if you start using long pauses between the answers you’re probably going to get the face.”

When Mr Obama asked to see “the face” Prince Harry gave him a stern look, prompting the US politician to laugh; “I don’t want to see that face.”