Simple source for the info - the guys who are leaving the RAF and were being given their 'Preparation for Civilian Life' lessons or whatever they call it. The guys I have spoken to (maybe it was more available at some squadrons/units than others) had the vast majority of the information available to them before they even submitted an application to BA.
I don't think it is a level playing field either!
Sorry for the slow reply but I don't sit down and read pprune every day.