Decided to pull the trigger on it yesterday, on Kindle for iPhone …a very detailed and very impressive, well-researched book.
I have to say I found numerous typos however, and one or two mistakes that I spotted; but overall probably the most comprehensive history of the ACO that has yet been produced, judging by comments on here (I haven’t read Lamond or Philpott sadly).
Chapters 1-3 in particular merit special attention, covering the inception of what became the ADCC, and the transition from the ADCC to the ATC (in its original and widest form, including the UAS, and the “Air Sections of the OTC” - i.e. CCF(RAF)!)
Most interesting for me was that what we (in the ATC at least ) are taught / teach in respect of the origins of the “air cadet movement” - in ACP31 - is not entirely accurate in that omits the Bournemouth Young Airmen’s League (which almost became the British Young Airmen’s League) …was BYAL the basis / model for Chamier’s ADCC? (I believe that Wg Cdr Kidd strongly implies this in “Horizons”) …so - if Air Cdre Chamier is the Father of the air cadet movement, are the “Founding Fathers” of the air cadet movement actually Charles Longman and Robert Weller?
One are where I was disappointed is that there is no detail on that perennial (or in recent times at least…) and thorny question of why it was decided that Officers for service with the ATC (which 1941-48 incorporated what were to become the RAF(CCF) Sections) should be commissioned into a specifically created RAFVR Training branch.
Long standing members of ACC will know my interest in this, and I’ll admit I’d love to research it further if I had the time. There MUST be some ex-Air Ministry files in the National Archives at Kew relating to the policy decisions behind the formation of the ATC, and the decision commissioning Officers into the RAFVR(T) - whilst allowing Sqns / Civilian Committees to recruit and appoint Civilian Instructors and Warrant Officers locally, and into the ATC, not the RAFVR(T).
I suspect, the answer - as usual - lies in custom, tradition, and historical precedent. The Officer Training Corps (OTC) formed out of Haldane’s reforms of the Army, was established by Royal Warrant in 1908 (much as the Air Training Corps was established by Royal Warrant in 1941! …precedent?!); with Junior Divisions in schools, and Senior Divisions in Universities. In essence, the Junior Divisions of the OTC were to become the CCF in 1948, with the Senior Divisions becoming what we now know as UOTCs within the TA (Army Reserve!). I can’t find the 1908 OTC Royal Warrant online, but if it specifies that Officers for service with the OTC are to be commissioned into the TA; then we have the obvious precedent for Officers for service with the ATC commissioning into the newly and specifically created RAFVR(T), as specified in the ATC Royal Warrant. Wait out 
Cheers
BTI