A fairly entertaining read for its generalised review of how the Harrier fitted within the UK context during its career, but not much use if you're looking for a technical history of this aeroplane, as the title 'Harrier' might suggest.
It does frequently take off (no pun intended!) at frustrating tangents from the main subject, but once you're used to this, it's quite interesting.
The author does tend to repeat himself, and is rather fixated about the Spitfire - virtually to the exclusion of any other 1940's era aircraft that would be more comparable to the Harrier role (eg Typhoon, Tempest, Martlet, ..?) - perhaps the author is new to the subject?
There are also a number of technical errors which points to a misunderstanding as to how the aircraft functions, best summarised by another reviewer here - 'Chris'. For example, I too was mystified as to how the Harrier could be controlled in the hover by the exhaust gases 'passing over the control surfaces', or how a shoulder mounted wing could protect the fuselage from exhaust.
Nonetheless it does provide some illuminating political, economic & social context for this aircraft - and others, notably the BAe Hawk - as well as interesting discussion about its development, just don't expect much about the Harrier!