You clearly have no knowledge about the high standards required to wear an RAF Brevet. As a Navigator I gurantee he knows more than you about Nav groundschool subjects, just as a Flight Engineer or Electronics officer would know more about the Technical. For further reading I can point you to the stories of several "one wingers" who won the Victoria Cross for outstanding personal bravery and airmanship!
Ayla: For starters he is no longer in the RAF so wearing a brevet does not mean anything in civilian aviation. He might have been a good navigator but the cadets don't need a navigator they need someone to teach them JAR ground school stuff, not someone to leave them in the classroom and let the CBT take care of the teaching. Lastly The Chief Ground Instructor of this FTO did not pass the ATO Ground Instructer Licensing exam he actually failed 3 times and you talk to me about standards......This guy is the worst chap to wear the RAF Brevet!