Early WW2 RAF Accident Investigations - Adequate or Not?

[Observer1940]

AIR 2/11702 Accidents Investigation in War Air Ministry and MCA Responsibilities.
File No. C50513/52 Opened 12/9/52

“By August 1942”
“The reception of accident reports from Command etc., was transferred from P.4 (Cas) to C.I.A. who was responsible for satisfying himself as to the adequacy of the Inquiry into each accident.”
[C.I.A. being Chief Inspector Accidents]

“1943/44 as a result of the Ludlow-Hewitt Enquiry, the investigation of RAF accidents was placed squarely on the shoulders of Group Commanders and an organisation called the Deputy Directorate for the Prevention of Accidents was brought into being to ensure remedial action was taken in every case.”

“A.I.B. now a part of the Ministry of Civil Aviation and entirely separate from the Air Ministry.”

I’m interested in what other additional general information has been discovered by you into early WW 2 RAF accidents, from other official records and other official local sources, besides the Flying Accident Card summary and perhaps a brief reference / no reference in the various Squadron; Station; Group or Command ORBs?

Mark