Link (Thanks, Jason!)
His spokeswoman said he had tampered with the CDs in branches of HMV and Virgin as well as independent record stores.
He visited cities including Bristol, Brighton, Birmingham, Newcastle, Glasgow and London, she added.
A spokesman for HMV said the chain had recovered seven CDs from two Brighton shops but was unaware that other locations were affected...
A spokesman for Virgin Megastores said staff were searching for affected CDs but it was proving hard to find them all.
"I have to take my hat off - it's a very good stunt," he added.
Update: Here's the pix! (Thanks, Robert, Scott, Xeni and others!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.