By Tim Masters
Entertainment correspondent, BBC News
The Bandaged TOGether album is due out in October
Just hours after announcing his departure from his breakfast show, Sir Terry Wogan was putting his vocal talents to work on a charity recording of a classic Beatles song at Abbey Road Studios.
The 71-year-old broadcaster had told listeners he was stepping down from his BBC Radio 2 show shortly after Monday's 0800 news bulletin.
Two hours later, he arrived at Abbey Road studios - in leafy north-west London - where he found himself doing a live TV interview as soon as he got out of his car.
"In the words of the old song, I'd rather leave while I'm in love," he said, before heading into Abbey Road's famous Studio Two.
He was joined inside by stars including Pink Floyd drummer Nick Mason and former Rolling Stone Bill Wyman to record All You Need Is Love in the same place where The Beatles recorded their original.
Sir Terry scored a top three hit single last Christmas
The "supergroup" was formed for a project organised by Terry Wogan fans known as The TOGs (Terry's Old Geezers and Gals).
All You Need Is Love will appear on the forthcoming Bandaged TOGether album raising money for Children In Need.
Sir Terry also performed a duet with Irish singer Finbar Furey on a version of the folk ballad The Fields of Athenry.
After 90 minutes of recording, including a stint behind the microphone with Pudsey Bear, Sir Terry told me he wasn't greatly surprised at all the interest in Monday's announcement.
"I suppose it's gratifying in a way that so many people seem to be so sad," he said.
"I feel sad myself - it's been a very difficult today to have to say what I have to say. But I felt it was time; you can't go on forever, only the river goes on forever, I'm just a mortal man.
"And perhaps it would be a good idea if I didn't have to get up at 20 past five every morning for the rest of my life."
So how will he be spending those extra hours in the morning?
"I'm going to eat a full English Breakfast, an Ulster fry - and swell to 25 stone before your very eyes, and I shall get under my wife's feet," Sir Terry said with a typical twinkle.
Rock legends Nick Mason (left) and Bill Wyman (right) lend their talents to the track
Clutching his drumsticks, Pink Floyd's Nick Mason said he was flattered to be asked to play on the charity record.
He was also watching the media scrum around Sir Terry with interest.
"Everyone knows he's incredibly important to broadcasting," he said. "It's even more exciting that he's been replaced by Chris Evans - which seems to have driven people into a frenzy of excitement and fury."
Mason recalled working at Abbey Road in the early days of Pink Floyd.
"When we first started we were recording our first album in number three studio and the Beatles were recording Sgt Pepper in this studio, so we were granted an audience - it was a bit like meeting God."
Former Rolling Stone Bill Wyman, who is playing bass on All You Need Is Love, said of Sir Terry's announcement: "Everybody has to stop sometime, but we'll still see him around."
Sir Terry, meanwhile, was juggling his press interviews and singing duties in his usual unflappable style.
He was unrepentant about stealing Chris Moyles' headlines on the day his rival became the longest-serving breakfast DJ on Radio 1.
"Yes, a pretty nasty trick of mine," he laughed. "He'll blame me forever. He's broken Tony Blackburn's record - it's a proud boast."