You are correct about the 12 hrs flight time including 6 hrs PIC minimum - my late night error!
However,
a training flight of at least 1 hour (or a maximum of three totalling 1 hour) with the same flight instructor or class rating instructor.
has now been amended by Commission Regulation (EU) 2015/445 of 17 March 2015; the hour if refresher flying no longer needs to be a gained in a maximum of three flights with the same instructor.
Anyway, the report should really have been 100% correct to establish whether the PIC had a valid SEP Class Rating and Instructor Certificate.
Nevertheless, the report makes shocking reading concerning flying supervision, aeroplane maintenance records, ANO compliance, pilot qualifications, pilot recency etc. etc.....
The engine hadn't received any overhaul in 24 years, no-one seemed to have checked or replenished the oil that day, many of the engine instruments were unserviceable as were the artificial horizons and altimeters...
Does the RAF still have a Flying Supervisors' Course? If so, this accident should be used as an example for FSC students.