But who the f*** is David Shaw ... and how did he come to know the case so deeply? Why is it, that David Shaw, in particular, has come across this info? And who has spilled their guts? I know these questions wont be answered on here... but they should be asked.
According to the link you posted David Shaw is body builder John JT Terilli. He owns this gym
http://www.broadwaygym.com.au/about-broadway-gym/ - if anyone wants to waste their time asking if he is THEE David Shaw who wrote the Bamber manuscript then you have a head start. Personally, I can't see someone who deicates their life to body building, have the time, or inclination to write such a thing. Good luck!