Beardy
There were 2 independent audits of the system a year (all aspects) by teams from ACCGS and CFS Examining Wing. Later in my time on the VGS we also quite often got secondments to us from ACCGS or CFS to instruct on the courses.
I'd suggest that 3+ independent audits a year of 'standards' is certainly more than adequate. Each audit/inspection followed up with a comprehensive report listing faults found, remedial action required and timescales to do it in.
The auditors also had the authority to stop flying operations or suspend the VGS IMMEDIATELY if serious or critical deficiencies were found.
That's probably more inspections, reports and checks of operations than most units go through in a year.................
It is probably also worth noting that the failure of the system appears to have been solely confined to activities either at the centre of operations and policy or in the activities run from the centre of policy...............no issues have been found on the VGS themselves during this 'witch hunt' - yet it is they who are being wound up/down or 'punished/rewarded' (depending which way you look at it)
Arc