As Evalu8ter says in point 2 above;
2. Does it include trg all the way to Combat Ready? To end of OCU? To Wings? Massive differences depending on what you're measuring to....
At the end of of CPL/ATPL training the candidate can fly the appropriate aircraft to the required standard and operate it safely in a commercial environment. That happens about 2/3rds of the way through military training. After that the candidate has to learn to fight the aircraft in its mission role - safe operation of the aircraft is the baseline assumption beyond this point, everything else is about delivering the mission.
Also note that not even the MoD has a requirement to make a profit on delivering death and destruction, so 4 million quid gets you the very best in training and equipment. If it was being done for a profit that number would fall, along with the quality of the training provided. PFI anybody?