Chris Denning, the former Radio 1 disc jockey, is writing a book in defence of his relationships with under-aged boys. Despite the protests of friends, who fear they will be implicated, he plans to publish the book in Europe and hopes it will also be distributed in Britain.

Denning, the man credited with the discovery of 70s pop group the Bay City Rollers, was a best friend of convicted pop impresario Jonathan King. He now lives in exile abroad. In Britain he is wanted for a series of alleged child sex offences. He served three-and-half years in prison in the Czech Republic for the sexual abuse of young boys, but left Prague last November after a failed attempt to extradite him to Britain.

King's name was mentioned by one of the boys involved in the Czech prosecution, which led to the investigation of King by Surrey police last year.

Denning, 60, comes from Bracknell, Berkshire and was one of Radio 1's original DJs in 1967. He now plans to write an 'honest' account of his life. In this country he has convictions for sexual assault, gross indecency and child porn, dating back over three decades, and is alleged to have been involved in a child abuse ring with several other well-known members of the entertainment industry.

News that he is writing a campaigning book has provoked a strong response among Denning's friends, he says. He told The Observer : 'Some of my friends are strongly against the idea.'

Tomorrow night Denning will appear in a controversial Channel 4 documentary about Jonathan King made by the journalist Jon Ronson. Ronson interviewed Denning after his release from prison in Prague.

Another friend of King, the songwriter and record producer Steven Jolley, was jailed for 18 months last year for indecently assaulting a 12-year-old boy.