Adele was left completely speechless as Scott welcomed them to the studio, while she was discussing her preparations for Sunday’s 26-mile run.
During the chat, the Wills and Kate revealed their love of the station, admitting he once had a shout out from former DJ Sara Cox.
“I felt very privileged,” he said. “I’m probably on the edge of your age limit, I’m probably supposed to go on Radio 2 now but I’m hanging on in there.”
They also discussed their memories of attending Radio 1’s Big Weekend in Bangor in 2010.
“That’s when we first saw Ellie [Goulding] perform live,” Kate said.
“Cheryl Cole was there and we had a very sweaty man hug with Tinie Tempah, which was amusing,” William added.
And not content with just making a guest appearance, they then stuck around to count down the top 40 biggest-selling songs this week on the chart show with Greg.
“We’ve been brought because Greg isn’t good enough,” William joked.
“It’s not been an ambition to do it, but I do listen. I remember a few weeks ago when Ed Sheeran seemed to occupy the entire thing.”
You can listen to the show again on the Radio 1 website.