Let me guess where you heard about this plane. You saw it on History's Greatest Blunders on the History Channel! I loved that De Lorean sports car! Its a shame that its no longer in production.
Well anyways, sorry I don't know any sites on the Brabazon. All I know is that Bristol was the manufacturer of that aircraft. You might want to search for that. Bristol did go bankrupt a while ago which is quite dissapointing! There might be a site on its history though!
"Generosity is giving more than you can, and pride is taking less than you need." - Khalil Gibran