I'm not sure this programme was really about airworthiness rather it was highlighting of the avoidance of costs, at all cost, over the last 20 years or so.
The fact is there is no real "military airworthiness system" because no-one can argue with MOD/IPT decisions not to do anything - until just after it has been proven to be an incorrect decision.
That is not "airworthiness" but "litigation reaction maintenance".
Rigga