I am more concerned and very annoyed when so called 'experts' falsify and re-write history, such as when a well known publisher of car repair manuals published a book about Main Battle Tanks. The 'expert' who wrote the book clearly stated that Vickers, designed and built the first Challenger MBT's, and, were responsible for using Rolls Royce CV12 engines as it's powerpack instead of the Leyland L60 used in Chieftain. All wrong.
Another so called 'expert' wrote a series of books about Rolls Royce from its inception to the present day, he too said Vickers insisted on the CV12's and built the first Challengers.
How do I know, I worked there when the ROF was designing the Challenger, and there when they were first handed over to the British Army in March 83.