A fairly definitive history of 2000AD was published a few years ago, in the form of Thrill Power Overload, but that volume was written by David Bishop, the man original 2000AD-creator and UK comics prime mover Pat Mills came to view as his nemesis (no pun intended). As such, I'm unsurprised that Mills has at various times planned to write his own version of the events of 2000AD's launch, and apparently, in the current post-Dredd 3D climate, publishers are again showing interest in the book. Mills has posted an extract from the chapter on the hard-fought gestation of Judge Dredd at his recently-started blog. It's a very personal version of events - Mills is prone to skip about tangentially wherever his memory takes him, and why not? He's earned the privilege.
Chewie's Carnagized in First Look at Absolute Carnage: Captain Marvel #1