Just as an aside.Some might recall Harald Penrose , ex CTP Westlands and a well respected Aviation historian and author. Hal wrote a series of books in the 60's and 70's on the evolution of the U.K Aircraft Industry ( "British Aviation" with which Haraka Snr. had considerable involvement) . Hal decided to stop at 1939.
His reason to call a halt : "If I continue to write honestly with what I know, I fear being sued"