I have no opinion of Irvine.
I know little about him.
I have not read any of his stuff, and have no wish to.

Do you regard Todman as an historian?
Gary Sheffield?
Max Hastings.
Hart?
Malcolm Brown?
Fritz Fischer?
etc., etc.,.......the expensive cars, holidays and share ownership you love to brag about.)
(Again, remember the libel laws.
You are a prime target with the expensive cars, holidays and share ownership you love to brag about.)