Adam Bomb was also interviewed in the DN'B bio and he was roommates with Izzy for a while.
As far as I know the only good parts in that book are the interviews with Jimmy Ashurst and Eddie Asworth (producer of JJH and 117). And from what I've heard what Jimmy says in that bio also is said in a interview in June this year which is on
www.izzy.34sp.com (but the site is currently down)