Bono has sensationally suggested that U2 might break up next year. The Irish rock outfit, who earlier this week were chosen by readers of Q Magazine as the greatest act of the past 25 years, recently reaffirmed their status at the top by wrapping the highest-grossing tour of all time. But their charismatic front man has his doubts.

Ahead of the re-release of their 1991 album, Achtung Baby, Bono was worried that there just might be a line on the horizon. "I'm not so sure the future hasn't dried up,” the 51-year-old said. “It's quite likely you might hear from us next year but it's equally possible that you won't. We have so many [new] songs, some of our best.

“But I'm putting some time aside to just go and get lost in the music. I want to take my young boys and my wife and just disappear with my iPod Nano and some books and an acoustic guitar."

But Bono also admitted that he has been getting some stick from band mates Larry Mullen, The Edge and Adam Clayton about his ongoing doubts about U2’s future. "The band are like, 'Will you shut up about being irrelevant?'"

But Achtung Baby might be the key to the way forward as Bono has admitted that revisiting the classic album has suggested a new path forward. "Being forced to look back at this period reminds me of how we might re-emerge for the next phase," he says. "And that doesn't mean that you have to wear some mad welder's goggles or dress up in women's clothing. Reinvention is much deeper than that."

First Westlife, now U2. Whatever next? Don't hold your breath though - it was only last month, at the Toronto Film Festival, that Bono said the band would be together 'until they die.'