Interesting stuff here...
Where did I get that 60° in bank and 30° in pitch from, anyway? I know what the U.S. FARs say, and it is not there in so many numbers, no. This is some extra information defining an "abnormal attitude" but where exactly do those numbers come from? Perhaps they are in Part One, "Definitions", in the Airman's Information Manual, which I do not have here ready to hand. Or it might be one of those things that "everyone knows" that is not strictly correct.
This 90° in bank and 60° in pitch; is that specific to one pilot's display routine or is that the general UK CAA definition of the starting limits for an "abnormal attitude" where aerobatic flight begins?