DJ Moyles in broadcast record bid
Chris Moyles has kicked off a marathon presenting bid - and announced he was planning to stay on air even longer to set a world record.
The Radio 1 breakfast host had been due to keep broadcasting for 37 hours solid to raise thousands of pounds for Comic Relief.
But he then announced he intends to continue on the airwaves for 51.5 hours in the hope of establishing a new record, for the radio DJ endurance marathon.
Moyles said: "By the time we've done 37 hours we may as well go for broke and hit 51.5 hours and set a new world record. That means that we can hopefully raise even more cash for Red Nose Day - although I do think we might be completely mental."
His sidekick, "Comedy" Dave Vitty, said: "I'm apprehensive, nervous and confident that it's a wholly stupid idea."
Celebrities and fellow DJs will be helping the duo and lending their support as guests and by sending messages.
Jimmy Carr, The Wanted, Katy B, Chipmunk, Davina McCall and Olly Murs are among those due to appear as guests.
The presenters are allowed a five-minute break for every hour on air, or can save it up for a longer sleep later. They will join other DJs throughout the day when other scheduled programmes come on air.
Today's record attempt is being broadcast on digital TV via the red button and at the station's website, bbc.co.uk/radio 1.
The longest Radio 1 show before today was the 37 hours set by Simon Mayo in 1999, again for Comic Relief.