I'm really not sure what to say about this book. On one hand, I am sure that it's a fine work of reference with many useful 'hard numbers of performance' like stall speed, climb, turn, roll and so.
As well as the general impression and 'feel' for the aircraft among the test and evaluation pilots from RAF and the Royal Aircraft Establishment
For those who are that much into details I'm sure it's a good book to have on the shelf for . . . . reference.
However, to me - with the 'angle' I have to combat aviation history - the book is a bit dry.