To be fair to Mick Wall, he was not the writer of the additional chapters on subsequent editions. I seem to remember Dave Ling was responsible for the updates on one edition and a different person on the other one (I will check later today at home).
Edit: To this day, I am yet to find the answer about the reasons for the fallout between Mick Wall and Rod Smallwood that meant subsequent editions of the biography were completed by different people. I have always wondered if a tongue-in-cheek review of the Shepherd's Bush Empire 2001 fan club shows could have been the reason. I have been unable to find it online, but if I remember correctly the different members of the band were described as Mr Men characters (Mr Cocky was one of them

).